Aleksandar Kovacevic marked his ATP Tour main-draw debut by knocking seventh seed Miomir Kecmanovic out of the Korea Open on Monday.

American Kovacevic was only playing in the first round as a lucky loser in Seoul after he was beaten in the final round of qualifying, but he grasped his chance by winning 6-4 6-4.

The 24-year-old served 14 aces and broke the world number 32 three times to set up a second-round meeting with Christopher O'Connell or Tseng Chun-hsin.

Radu Albot got the better of Hiroki Moriya in his first appearance in Seoul, while Jaume Munar progressed when Yosuke Watanuki retired early in their match due to an ankle injury.

Kaichi Uchida came out on top in the final match of the day, consigning Hong Seong-chan to a 6-4 6-2 defeat.

In an all-American final at the San Diego Open, Brandon Nakashima defeated Marcos Giron 6-4 6-4 to capture the first ATP Tour title of his career.

Nakashima, 21, was playing in the third final since arriving on the ATP Tour, having lost the deciders at both the Atlanta Open and the Los Cabos Open as a teenager back in 2021.

Against Giron, the first set lasted just 35 minutes as San Diego native Nakashima converted the only break point opportunity of the frame, while winning 80 per cent (20-of-25) of his service points.

In a spectacularly efficient display, Nakashima hit 15 winners and only one unforced error, while adding six aces with no double faults.

He cooled off slightly in the second set, but it was still more than good enough, posting another 15 winners with five unforced errors and grabbing a break of serve in the opening game.

Giron would finally nab his first break of the contest in a game where he converted on his fourth opportunity, but Nakashima immediately answered to jump ahead 4-2 and serve it out cleanly.

With the win, Nakashima will rise into the top 50 of the world rankings for the first time when it is next updated.

Roger Federer said he felt the pain of Team Europe's first Laver Cup defeat as the World team crashed the Swiss great's farewell party in breathtaking style.

The final event of Federer's playing career veered off the script as he and Rafael Nadal lost in doubles on Friday, before the team collectively succumbed to a 13-8 defeat in London.

Stunning singles wins for Felix Auger-Aliassime and Frances Tiafoe on Sunday, against Novak Djokovic and Stefanos Tsitsipas respectively, followed a doubles thriller that saw Auger-Aliassime and Jack Sock topple Andy Murray and Matteo Berrettini.

After Team Europe won the first four editions of the Laver Cup, this time they had to swallow the bitter pill of defeat, with Federer sorry to sign off on a losing note.

"Of course I'm disappointed," he said. "I was on the team. I almost lost my voice. My hands hurt from clapping.

"So, yes, I am disappointed. We wish the result would be different. I told Andy [Murray] in the locker room, I don't like losing. It's not fun. It just leaves not the best taste, you know. I think once you have been there and taste success, it's just not the same."

He said his goodbye tournament had been a mix of highs and lows.

"This weekend has been all over the place for me," said the 41-year-old Swiss. "I enjoyed it, but it's unfortunate that we couldn't get the win tonight."

Federer denied he has his eyes set on becoming the next Team Europe captain. Incumbent skipper Bjorn Borg and Team World counterpart John McEnroe have indicated next year's match could be the last that they helm, which would create an appealing vacancy.

"No plans there. Bjorn's doing a great job," said Federer. "Who knows, maybe one day, but we don't have any plans so far."

Next year's match takes place in Vancouver, and Federer will certainly have a role of some sort to play, given he is a co-founder of the event.

"I went through all different types of Laver Cups so far: the first one, the winning teams, now this time on the losing team," Federer said. "There was also one where I was hurt last year but seeing it more from the stands and from the fans' perspective, and now deep on the inside with retirement.

"I have enjoyed the Laver Cup in many different ways, and next year again will be totally different. I'm looking forward to it, and I'm sure Vancouver is going to be fantastic."

Asked what he would miss about tennis, Federer said: "Not the losing press conferences, I tell you that. They are the worst."

Felix Auger-Aliassime and Frances Tiafoe played starring roles as Team World won three matches on the spin on Sunday to claim a first Laver Cup triumph over Team Europe.

Team World went into the final day of action at the O2 Arena in London sitting four points behind their opponents, but they produced a stirring fightback to claim the trophy at the fifth time of asking.

Central to their success was Canadian Auger-Aliassime, who beat Novak Djokovic in singles after successfully teaming up with Jack Sock in the doubles.

Holding an 8-4 lead from Saturday, many expected Team Europe to breeze it from there, but John McEnroe's World team had other ideas and earned a 13-8 victory. 

Up first in the doubles were Auger-Aliassime and Sock, who lost the first set to Team Europe's Andy Murray and Matteo Berrettini.

However, the World duo roared back to deliver three points for their team by claiming a 2-6 6-3 10-8 victory.

Djokovic won two matches for Team Europe on Saturday, yet he was powerless to stop Auger-Aliassime in their singles clash. The 22-year-old Canadian landed a 6-3 7-6 (7-3) over the Wimbledon champion.

That moved Team World 10-8 ahead in the overall contest, setting the stage for a decisive clash between Stefanos Tsitsipas and Frances Tiafoe, with a further three points at stake.

Greek Tsitsipas won the first set, but 24-year-old American Tiafoe stormed back to win an epic tie-break in the second on his way to a 1-6 7-6 (13-11) 10-8 success.

Lorenzo Sonego fended off the challenge of Alexander Bublik to win Sunday's Moselle Open final and earn a return to the top 50 in the world rankings.

In Metz, France, unseeded Italian Sonego swept to a 7-6 (7-3) 6-2 victory in the trophy match, collecting the third ATP title of his career.

He enjoyed a stellar week at the ATP 250 event, following up wins over Gilles Simon and Sebastian Korda with a semi-final victory against second seed Hubert Hurkacz, not dropping a set across his four matches.

Sonego, who reached a career-high ranking of 21st in February, had drifted to 65th in the months since, but the ATP said he would climb back into the top 50 as a result of his title run. The ATP's live rankings on Sunday showed him making a leap of 20 places to number 45.

Bublik, the seventh seed, had reached the final after Stan Wawrinka withdrew from their semi-final due to injury. He kept pace with Sonego on Sunday in a tight first set where serves dominated and neither man could force a break, with success for the Italian in the tie-break breaking the resistance of his Kazakh opponent.

The second set proved to be one-sided as Sonego added the title to his previous triumphs on tour, also extending his winning head-to-head record against Bublik to 4-0.

This indoor hardcourt success followed previous wins on grass in Antalya in 2019 and on clay in Cagliari last year.

Sonego said in an on-court interview: "This is a really emotional moment for me. I'm really happy because I played my best tennis this week. It's been a tough year and I want to enjoy this moment."

Local hope Brandon Nakashima will take on Marcos Giron in the San Diego Open final after the latter shocked top seed Daniel Evans in Saturday's semi-finals.

World number 58 Giron upset Evans 6-3 7-5 in one hour and 46 minutes, qualifying for his maiden ATP Tour final.

San Diego native Nakashima progressed into the decider after getting past Australian Christopher O'Connell 6-4 7-6 (7-3).

Nakashima's triumph means he is into his first tour-level final of the season and it has come in familiar territory.

The fifth seed needed one hour and 50 minutes to beat O'Connell, who had the edge in the key statistics, including 8-7 aces, 34-31 winners and 13-16 unforced errors.

But Nakashima came up big when it mattered, managing the only break of the match in the first set, before triumphing in a tiebreak.

Giron produced the surprise result against world number 25 Evans, who was chasing his first-ever ATP Tour title.

The American sent down 11 aces, while he also hit 40-25 winners. Evans was unable to convert any of the three break points he generated throughout the match.

Stan Wawrinka abandoned his first ATP semi-final for over two years as the veteran Swiss bowed out of the Moselle Open on Saturday.

The 37-year-old was taking on Kazakhstan's Alexander Bublik and trailed 2-1 in the opening set when he decided he would be unable to complete the match.

Bublik had broken serve and led 40-30 in the fourth game when Wawrinka approached the net and told the umpire he had to stop.

Wawrinka has been battling a thigh injury that appeared to be the cause of his withdrawal, meaning the three-time grand slam champion, now ranked a lowly 284th, could not push on with his quest for a first ATP Tour title in five years. His most recent semi-final appearance, prior to this run in Metz, had come in Doha at the start of 2020.

Italy's Lorenzo Sonego awaits Bublik in Sunday's final after he sank the hopes of Polish second seed Hubert Hurkacz in the first semi-final.

Unseeded Sonego took the win 7-6 (7-5) 6-4 and will be chasing a third ATP title, after previous triumphs in Antalya in 2019 and Cagliari last year.

Bublik, the seventh seed this week, has just one previous singles title, earning that success in February of this year in Montpellier.

Roger Federer "made the whole world dream" through his tennis, French football great Zinedine Zidane said on Saturday.

The Swiss superstar contested his final match on Friday night in London, as he bowed out at the age of 41, accepting knee trouble in recent years would not allow him to carry on.

Zidane's last match as a player famously ended in a headbutt, a red card and crushing disappointment in the 2006 World Cup final, as France lost out to Italy on penalties in Berlin.

That was a far cry from the celebratory scenes at the O2 where 20-time grand slam winner Federer exited in a hail of adulation and high emotion, as the man from Basle broke down in a flood of tears on court.

The poignancy came after Federer lost alongside Rafael Nadal in a Laver Cup doubles clash with Jack Sock and Frances Tiafoe, a low-stakes occasion compared to Zidane's swan song.

Both Zidane and Federer played their sport with maverick and artistic tendencies that set them apart from many of their peers, while also winning a stack of trophies.

Zidane had two spells as Real Madrid boss after hanging up his boots following a playing spell at the Santiago Bernabeu, and he hopes there are great opportunities awaiting Federer too.

"Today you are stepping into another world. I wish you a second part of life as rich as the first," Zidane wrote on Instagram.

"Thank you Roger, you made the whole world dream! And you remained profoundly the same. Thank you Roger, the great class."

Roger Federer has thanked fans and fellow players for providing him with a "magical" send-off at the end of his glittering professional career on Friday.

The 20-time grand slam champion brought the curtain down on his incredible career in a doubles match alongside Rafael Nadal at the Laver Cup in London, facing off against American duo Jack Sock and Frances Tiafoe.

Although Federer and Nadal fell to a 4-6 7-6 (7-2) 11-9 loss, the Swiss maestro was given a hero's reception at the O2 Arena, and old rival Nadal joined him in shedding a tear after the match.

Immediately afterwards, Federer joked he was simply glad to have avoided injury and described his career as a "perfect journey".

Federer then expressed his appreciation for everyone involved on Saturday, writing on Twitter: "It was a magical evening yesterday. 

"Thank you again to all the players and fans who were here to share this moment with me. It means the world."

Speaking at a news conference after his send-off, Federer described it as "all happiness".

"The match, yes, in itself, sure, is special," he said. "But it's really everything that happened after, because I wasn't aware who was going to come to sing, what was going to happen, where I should go, what was expected of me, or how long it was going to go.

"Then I guess looking around and seeing how everybody got emotional, obviously it's even better, or even worse, I'm not sure what to say.

"The last two days have been tough to say the least. Thankfully, in moments, I totally forgot about it, slept great, everything was wonderful, I could enjoy it. 

"Because of that, I think I will be able to have a better recollection of how it went, because if it's all just stress throughout and I want it to be only perfect, I know I will remember half of it.

"I didn't have fireworks in my head where I see my career flashing by, all the things I'm going to miss. It was hard for me making phone calls, letting people know that this decision is happening. There I felt pain, but now, tonight was all happiness."

Meanwhile, Federer has refused to rule out taking part in exhibition matches in the future, stating his desire to allow more of his fans to see him in action one last time.

"The message from me was just making sure I relay my passion for the sport to the fans, and I let them know that hopefully we'll see each other again on a different type of tennis court," he added.

"I have no plans whatsoever, where, how, when. All I know [is] I would love to go and play places I have never played before or go say thank you for years to come to all the people that have been so supportive of me.

"Because the hard part about the Laver Cup was that tickets were already sold out. The people who maybe would have also loved to be here couldn't make it. 

"Maybe there is another way down the stretch we can party all together."

Rafael Nadal has withdrawn from the Laver Cup after being paired with Roger Federer for the final match of the Swiss star's career on Friday.

Federer had announced he would be retiring following the tournament and was then only fit to feature in one doubles match.

But that gave the Swiss great the opportunity to team up with Nadal, with the duo falling to a narrow and entertaining 4-6 7-6 (7-2) 11-9 loss to Jack Sock and Frances Tiafoe at the O2 Arena.

That defeat marked the end of Federer's involvement in the Laver Cup, and Nadal's participation is over for this year, too.

Nadal has been dealing with an abdominal injury in the second half of this season, with the issue notably seeing him miss a Wimbledon semi-final against Nick Kyrgios.

However, the Laver Cup, announcing the Spaniard's absence from the weekend's play on Saturday, made no reference to any ailment, saying he had pulled out "for personal reasons".

Cameron Norrie took Nadal's place in the tournament and was set to face Taylor Fritz.

A tearful Rafael Nadal said "an important part of my life is leaving" after partnering Roger Federer for the final match of the Swiss great's career at the Laver Cup in London.

The last match of Federer's career saw him partner with his great rival Nadal to play doubles for Team Europe on Friday, taking on American duo Jack Sock and Frances Tiafoe at the O2 Arena.

Despite taking the first set, Nadal and Federer ultimately fell to an entertaining 4-6 7-6 (7-2) 11-9 loss before watching a series of tributes to the Swiss maestro, who also had an on-court interview and was embraced by his team-mates, opponents, family and friends.

Nadal, one of just two male players with more grand slam wins than Federer's 20 (22, also Novak Djokovic with 21), was seen to be in tears as he sat next to the retiring star during the post-match tributes.

During the match, he also showed signs of nerves due to the scale of the occasion and later declared he would hugely miss his long-time rival. 

"It has been a difficult day to handle every single thing, and at the end everything became super emotional," Nadal said. 

"For me, it has been a huge honour to be a part of this amazing moment of the history of our sport. 

"When Roger leaves the tour, an important part of my life is leaving too because of all the moments that he has been next to me or in front of me in important moments of my life.

"So, I have been emotional to see the family, see all the people. Difficult to describe, but amazing moment."

Top seed Daniel Evans is through to the last four at the San Diego Open after defeating Constant Lestienne 6-1 6-3 in Friday's quarter-final

It was perhaps a closer contest than the final score indicates, with Evans creating 13 break point opportunities while Lestienne created 11, but the Englishman was able to save 10 of the 11 he faced while converting five himself.

Ultimately the difference between the two players was Evans' ability to avoid wasteful errors, posting 23 winners with 12 unforced errors while Lestienne had 15 winners with 21 unforced errors.

Evans will play third seed Marcos Giron for a spot in the final after the American beat Australia's James Duckworth 7-6 (7-5) 6-3.

It was a match that was decided by the efficiency of Giron, who was more accurate with his serve, landing 59 per cent of his first serves fair compared to 47 per cent for Duckworth.

The Australian actually created more break point chances – eight to three – but while he converted two of his eight chances, Giron turned all three into breaks.

While the top half of the draw played out as the seeding predicted, there was an upset in the late window as Christopher O'Connell eliminated second seed Jenson Brooksby 6-4 4-6 7-5.

The Australian had a clear serving advantage, smacking 14 aces compared to four for Brooksby, and he also racked up a massive 50 winners with 16 unforced errors. Brooksby had 24 winners with 21 unforced errors.

Despite being the better shot-maker on the day, O'Connell had to save two match points to keep his chances alive, and then broke Brooksby as the American tried to serve it out, rattling off four consecutive games to end the match.

O'Connell will face Brandon Nakashima in the semi-final after he emerged victorious 6-3 4-6 6-4 against Daniel Elahi Galan.

Nakashima has now won five of his past six matches, with the only loss in that stretch coming against Jannik Sinner in the US Open.

An emotional Roger Federer bid farewell to the game he loves following Friday's Laver Cup doubles loss alongside long-time rival Rafael Nadal, calling his send-off "exactly what I hoped for".

Federer and Nadal went head-to-head with American duo Jack Sock and Frances Tiafoe in the 20-time grand slam champion's last ever match, but after taking the first set, the megastars lost a second-set tie-break as well as the match tie-break for a 4-6 7-6 (7-2) 11-9 result.

The 41-year-old was then given the stage to reflect on his incredible journey to becoming one of the greatest players to ever grace the court.

After sharing his fear that he would not be able to get any words out due to the emotions of the moment, he said it was a perfect way to wrap up a perfect career.

"It's been a wonderful day," he said. "I told the guys I'm happy, I'm not sad. It feels great to be here, and I enjoyed tying my shoes one more time, and everything was the last time.

"Funny enough, with all the matches, and having the guys, and being here with fans, family and friends – I didn't feel the stress so much, even though I did think something was going to go. Pop a calf, or lock my back or something.

"I'm so happy to make it through, the match was great, I couldn't be happier. It's been wonderful.

"Of course, playing with Rafa on the same team, and having the guys all here, the legends… thank you."

With Nadal, Novak Djokovic and Andy Murray among those in the Team Europe corner, Federer said it was a special feeling to get to share his finish line with other icons of the sport.

"It's amazing, it really is," he said. "I didn't want it to feel lonely out there… to be saying goodbye in a team, I always felt I was a team player at heart.

"Singles doesn't really do that a whole lot, but I've had a team that travels with me around the world, that's been amazing with them.

"It does feel like a celebration to me. I wanted to feel like this at the end, and it's exactly what I hoped for, so thank you."

When asked to reflect on his legacy and standing in the game, Federer became overwhelmed with emotion, saying "it was never supposed to be that way".

"I was just happy to play tennis, and spend time with my friends really," he said. "And it ends here. It has been a perfect journey and I would do it all over again.

"It's been great. It's been so much fun. It's been amazing."

A tearful Roger Federer bid goodbye to a 25-year career with defeat at the Laver Cup in a doubles contest that went past midnight in London.

Federer teamed with long-time rival Rafael Nadal against American duo Frances Tiafoe and Jack Sock as Team Europe face Team World at the O2 Arena.

After winning the first set, the Swiss and the Spaniard were faced with a spirited fightback from Tiafoe and Sock, who won a second-set tie-break before also clinching the match tie-break to seal victory 4-6 7-6 (7-2) 11-9.

There had been a great atmosphere in London on Friday for the fifth edition of the three-day competition.

Federer, 41, had not played a match since he was knocked out of Wimbledon by Hubert Hurkacz at the quarter-final stage last year due to knee injury.

There were huge cheers when Federer and Nadal came onto the court and loud roars for the Swiss great when he came up with his first winner.

There was a sensational moment in the first set when Federer appeared to have won a point after his shot hit the top of the net and bounced in, only for a replay to show the ball had somehow been hit through a small hole between the net and the post, meaning Team Europe lost the point, despite the remarkably unlikely event of the ball passing through such a gap.

Novak Djokovic and Andy Murray were among Federer and Nadal's team-mates offering some tactical input between games, and the legendary duo had to save a first break point of the match before the Spaniard held to put them 5-4 up.

It was two of the all-time greats that took a tight opening set when Sock put a volley into the net, prompting Team World captain John McEnroe to tell his doubles pair they appeared to be getting "caught up in the hoopla." 

A determined Team World managed to level it up after a back-and-forth second set went to a tie-break, with Tiafoe and Sock coming out on top with their superior power and pace.

That took it to a dramatic deciding match tie-break, with every point keeping fans holding their breath, including some trademark Federer magic at 6-7 when he diverted a Sock shot across court for a crowd-pleasing winner.

It looked like the dream script was being followed as Federer served at match point for himself and Nadal, but the former could only hit a shot into the net, before Sock and Tiafoe won the next two points to secure the win for Team World.

It was then hugs all round as respect was paid to the 20-time grand slam winner at the conclusion of a phenomenal career. 

Earlier in the day, Casper Ruud drew first blood for the Team Europe, beating Sock 6-4 5-7 10-7, before Stefanos Tsitsipas doubled their advantage with an emphatic 6-2 6-1 defeat of Diego Schwartzman.

There was drama after the first set of that second singles match when a protester, wearing a T-shirt with the message, "END UK PRIVATE JETS" on, set their arm alight on court before being escorted out by security. 

Alex de Minaur then got Team World on the board with a 5-7 6-3 10-7 success over home favourite Murray before the late-night main event under the lights.

Stanislas Wawrinka edged closer to a first ATP Tour title in five years after edging Mikael Ymer in a thriller to reach the Moselle Open semi-finals.

On the same day fellow countryman Roger Federer would hang up his racquet at the Laver Cup, Wawrinka was forced to go all the way by his opponent in Metz, eventually winning 6-4 4-6 7-6 (7-5).

The three-time grand slam champion, whose injury struggles and form have seen him tumble to 284 in the world rankings, served up seven aces to Ymer's two, and made no double faults.

Victory moves him into the last four, where he will meet seventh seed Alexander Bublik after the Kazakh saw off Holger Rune in another three-set encounter with a 6-3 5-7 6-4 win.

Defending champion Hubert Hurkacz is also through to the semi-finals after making quick work of home favourite Arthur Rinderknech, winning 6-3 6-2.

The world number 10 will face Lorenzo Sonego next after the Italian also came through his quarter-final in straight sets against Sebastian Korda.