Favourites Reilly Opelka and Grigor Dimitrov joined top seed Cameron Norrie in the quarter-finals of the Delray Beach Open after victories on Thursday.

With Norrie having already set up a quarter-final against last year's runner-up Sebastian Korda, the Briton was joined in the last eight by the second and third seeds. 

Grigor Dimitrov defeated Mitchell Krueger to mark his first appearance since a disappointing second-round exit at the Australian Open in style.

The Bulgarian won 7-6 (7-4) 6-3, with Serena and Venus Williams watching on from the crowd in far from ideal conditions in Florida.

"It's always very tough [in your opening match], especially playing the last match on," Dimitrov said.

"I've been here for a week already and I was eager to get out there and play. Today was just a match I had to get through. Very tough conditions: rain, wind, cold, hot. It is what it is, and you've got to deal with it."

Opelka, who won the tournament in 2020, went the distance against fellow American Jack Sock, eventually prevailing 6-7 (6-8) 7-6 (7-4) 6-1. 

He will face Adrian Mannarino in the last eight, after the Frenchman's 6-4 2-6 7-5 defeat of Brandon Nakashima. Dimitrov will play Australian John Millman.

At the Rio Open, only two of the four scheduled matches were completed due to rain.

Qualifier Miomir Kecmanovic dispatched sixth seed Lorenzo Sonego 7-5 6-4, while Francisco Cerundolo overcame Roberto Carballes Baena.

Top seed Matteo Berrettini's clash with Brazilian Thiago Monteiro was pushed back to Friday, while Carlos Alcaraz will resume his match against Federico Delbonis in a strong position in the first set.

Diego Schwartzman felt he played "an almost perfect match" to overcome Pedro Martinez in straight sets and reach the quarter-finals of the Rio Open.

The third seed advanced with a 6-1 6-1 victory, though that does not quite tell the whole story as the second game of the first set lasted a mammoth 24 minutes and 40 seconds.

Martinez saved eight break points in that lengthy game before finally being outdone by Schwartzman, who will now face another Spaniard in Pablo Andujar.

Incredibly, Martinez won 31 points in the first set but just one game.

"It was unbelievable," Schwartzman said. "This was probably the longest game in the history of the tournament 

"I don't remember anything like this before. I played an almost perfect match, I played against an opponent that had as much confidence as me."

Andujar beat Albert Ramos-Vinolas 7-5 5-7 6-3, while fourth seed Pablo Carreno-Busta lost 5-7 6-4 6-3 to Fabio Fognini in the shock of the day.

Federico Coria awaits Fognini after following up his surprise win over defending champion Cristian Garin with a 7-6 (7-2) 4-6 6-4 victory against Fernando Verdasco.

At the Delray Beach Open, top seed Cameron Norrie beat Oscar Otte 6-3 7-5 and will face Sebastian Korda, who saw off Andreas Seppi 7-5 6-3, for a place in the semi-finals.

Tommy Paul and Stefan Kozlov are also through to the final eight in Florida after beating Denis Istomin and Steve Johnson respectively in straight sets.

Andy Murray suffered one of the heaviest losses of his career in the second round of the Qatar Open, while Andrey Rublev escaped an early exit at the Open 13. 

Former world number one Murray went down 6-0 6-1 to last year's runner-up Roberto Bautista Agut in Doha on Wednesday. 

It was just the fourth occasion in which the three-time major champion has lost a match while winning only one game or fewer in his career – the last time being a defeat by the same scoreline to Roger Federer at the ATP Finals in 2014. 

Murray's fellow Briton Dan Evans also endured a second-round loss, going down 4-6 7-5 6-4 to Alejandro Davidovich Fokina – Bautista Agut's next opponent. 

Denis Shapovalov bounced back from his first-round loss to Jiri Lehecka in Rotterdam last week by dropping just eight points on serve as he claimed a 6-4 6-0 victory over Alex Molcan inside 52 minutes. 

Next up for the Canadian will be Arthur Rinderknech after the Frenchman came from a set down to defeat seventh seed Alexander Bublik 6-7 (5-7) 6-1 6-4. 

Nikoloz Basilashvili faced little trouble in overcoming Elias Ymer 6-4 7-5 and his reward is a quarter-final against Marton Fucsovics, who got the better of Kwon Soon-woo. 

Karen Khachanov and Marin Cilic will meet in the last eight after they respectively eliminated Emil Ruusuvuori and Botic van de Zandschulp. 

In Marseille, second seed Rublev was made to work hard for a place in the Open 13 quarter-finals by home hope Richard Gasquet. 

Gasquet went a break up in the third set and, after surrendering his advantage, stopped Rublev serving out the match to force a tie-break. 

However, the world number seven did not waste his next opportunity as he sealed a 4-6 6-4 7-6 (7-3) success. 

Aslan Karatsev also booked his place in the last eight, while there were wins for Frenchmen Benjamin Bonzi and Lucas Pouille too. 

Defending champion Cristian Garin was victim of the biggest shock of Tuesday's play at the Rio Open.

Fifth seed Garin – winner of the most recent edition in 2020 – exited a second consecutive tournament at the first-round stage after he was humbled by Federico Coria.

Coria had defeated the fifth seed, Dusan Lajovic, at last week's Argentina Open, too, but was particularly impressive on Tuesday.

A stunning 6-2 6-0 win was sealed in an hour and 16 minutes.

Coria fended off two break points midway through the first set and then won the remaining nine games in succession in a dominant victory.

Garin was the only seed to lose in Brazil, however, as Lorenzo Sonego was on the right side of a 6-2 6-0 scoreline against 2019 winner Laslo Djere.

Fabio Fognini also advanced in straight sets, while Spanish pair Albert Ramos-Vinolas and Fernando Verdasco similarly eased through.

At the Delray Beach Open, 2021 runner-up Sebastian Korda defeated Thanasi Kokkinakis in his first match since winning the Australian Open doubles title with Nick Kyrgios.

Former champion Sam Querrey came up short against Denis Istomin.

Teenage seventh seed Carlos Alcaraz fought back from a poor set to win 2-6 6-2 6-1 over fellow Spaniard Jaume Munar at the Rio Open on Monday.

The 18-year-old struggled for rhythm in the opening set but showed composure to respond by breaking Munar early in the second set and dominating from there.

Alcaraz took the victory in two hours and 15 minutes, saving 10 of 13 break points across the match, while dropping only three games in the second and third sets.

Spaniard Pedro Martinez set up a second-round clash with third seed Diego Schwartzman after a 6-3 6-4 win over Shang Juncheng.

Pablo Andujar Alba also progressed 7-6 (7-2) 7-5 over Pablo Cuevas, while Serbian qualifier Meomir Kecmanovic accounted for local wildcard Felipe Meligeni Rodrigues Alves 6-3 6-0.

At the Delray Beach Open in Florida, Steve Johnson beat South African veteran Kevin Anderson in just over two hours, triumphing 6-2 6-7 (5-7) 6-2.

Oscar Otte got past Yoshihito Nishioka 7-6 (10-8) 6-3 to set up a second-round date with top seed Cameron Norrie, while there were only two breaks across the match as seventh seed Maxime Bressy was ousted by John Millman 6-7 (2-7) 7-6 (7-2) 7-6 (7-3).

Italian veteran Andreas Seppi beat German Peter Gojowczyk 7-5 6-4, while young American Brandon Nakashima comfortably handled Denis Kudla 6-1 6-1.

Dan Evans and Karen Khachanov made strong starts at the Qatar Open on Monday, while top seed Denis Shapovalov learned who his first opponent will be. 

After just over an hour and a half, fifth seed Evans sealed a 6-4 6-4 victory over Egor Gerasimov in their first meeting on the ATP Tour. 

Evans won 85 per cent of points behind his first serve and did not face a single break point as he advanced to the second round. Malek Jaziri or Alejandro Davidovich Fokina will be his next opponent. 

Following a tight opening set, Khachanov overcame Mackenzie McDonald 7-6 (7-3) 6-3 to continue his impressive form early in the 2022 season.

Alex Molcan came from a set down and navigated a second-set tie-break to defeat Chris O'Connell and earn a meeting with Shapovalov in the second round. 

At the Open 13 in Marseille, home hope Richard Gasquet overcame Mikael Ymer 6-4 7-5 to book a meeting with Andrey Rublev in the second round. There were also wins for Stefano Travaglia and Ilya Ivashka. 

Reilly Opelka rammed 16 aces past Jenson Brooksby on the way to victory in two tie-breaks in the all-American final of the Dallas Open.

In a battle between two of the United States' brightest young men's tennis talents, neither could find a way to break the other's serve.

That meant it came down to the shoot-out of the tie-break in each set, with Opelka sealing a 7-6 (7-5) 7-6 (7-3) victory in an hour and 51 minutes.

It gives the world number 23 a third ATP title of his career, all of which have been won in America. His previous successes came at Delray Beach and the New York Open.

This indoor showpiece on Sunday was just a second main-tour final for 54th-ranked Brooksby, a player who caught the eye in a breakout 2021 campaign, and he found Opelka's serve impenetrable, as has been the case for all-comers throughout the week.

Opelka faced just one break point in the title match, the first against his serve all week, but staved that off. He had five chances against the Brooksby serve but could also not take advantage.

Rather than power, Opelka finished off the match with finesse, hitting a backhand winner after a teasing exchange. He then described 21-year-old Brooksby as "a future top-10 player" after keeping the youngster waiting for his first ATP title.

Brooksby was ranked outside the top 300 this time last year and is poised for a first top-50 breakthrough.

The champion was delighted with his own game, with Opelka saying at the trophy presentation: "I thought I played very well under pressure, especially against a great player like Jenson.

"He makes you very uncomfortable and he took me out of my comfort zone a lot of the match today. I really had to play my best tennis to get by and I barely did."

Casper Ruud collected his sixth ATP Tour title as he battled past Diego Schwartzman to win the Argentina Open for a second time on Sunday.

Ruud managed five ATP titles in 2021 and followed that up with another one in the new season as he recovered from a first-set scare to overcome local favourite Schwartzman 5-7 6-2 6-3 in Buenos Aires.

The Norwegian extended his record at the tournament to 9-0, having already lifted the trophy in 2020, after negotiating past his Argentinian opponent in two hours and 35 minutes.

Ruud, who was the top seed, had not dropped a set all week on his way to the showpiece final, but he faltered in the first set as he spurned a break point at 5-4 up, with Schwartzman holding to make it 5-5 before subsequently claiming the opener.

Schwartzman repeated the feat in his first service game of the following set, staving off four break points, but Ruud rallied at 2-2 to claim four straight games and send the match to a decider.

Schwartzman was the defending champion after ending a 13-year wait for an Argentinian winner in Buenos Aires, though it was Ruud who lifted the trophy as he overcame an early break to extend his winning streak in ATP 250 events on clay to 18.

The top two seeds Casper Ruud and Diego Schwartzman will face off in the Argentina Open final after the latter won two matches on Saturday to progress at his home event.

The Argentine world number 14 had to overcome countryman Francisco Cerundolo 6-3 2-6 5-7 earlier on Saturday after their quarter-final had been interrupted by rain on Friday evening.

The match was tied at 1-1 in the third set when rain intervened, with Schwartzman triumphing when play resumed to earn a semi-final date with third seed Lorenzo Sonego.

Schwartzman would later beat Sonego 7-5 3-6 6-2 in almost three hours on a busy day for the 2020 French Open semi-finalist.

World number eight Ruud progressed with a routine 6-3 6-3 victory over Argentine sixth seed Federico Delbonis.

At the Dallas Open semi-finals, Reilly Opelka and John Isner broke the record for the longest tiebreaker on the ATP Tour since 1990.

Second seed Opelka triumphed over fellow American Isner but it was not easy, winning 7-6 (9-7) 7-6 (24-22).

Opelka sent down 39-21 aces across the match, earning a spot in the final against fourth seed Jenson Brooksby who beat Marcos Giron 6-4 6-7 (4-7) 7-6 (7-5).

Jenson Brooksby made a winning start to his 2022 season on the ATP Tour as he reached the quarter-finals of the Dallas Open.

Last year's ATP Newcomer of the Year missed the Australian swing after testing positive for COVID-19 and only made his return at the Columbus Challenger at the end of last month.

The world number 54 admitted to feeling a little nervous in his 6-3 3-6 6-3 win over Andreas Seppi, but he said: "I competed well. As an American in the U.S., it was a great crowd. I missed that atmosphere for a few months.

"I thought I stayed pretty calm out there; a good balance of calm and competing, which is always a focus of mine."

Fifth seed Adrian Mannarino enjoyed smoother progress into the quarter-finals, beating Yoshihito Nishioka 6-3 6-1.

Vasek Pospisil saved a match point before coming through 6-7 (3-7) 7-6 (8-6) 6-2 against Jurij Rodionov, setting up a last-eight clash with home favourite John Isner, whose compatriot Reilly Opelka also progressed from a big-serving contest with Cedrik-Marcel Stebe.

At the Argentina Open, Fabio Fognini progressed to his first Tour-level quarter-final since April after battling past Pedro Martinez.

The Italian won 6-4 7-6 (7-5) to secure a meeting with Federico Delbonis, the Argentine having dispatched Pablo Andujar in straight sets.

Delbonis' compatriot Diego Schwartzman also defeated Spanish opposition in the form of Jaume Munar, although the world number 15 was made to work hard for a victory that sent him into a last-eight contest with Francisco Cerundolo.

Schwartzman came through 7-6 (7-2) 7-6 (7-4) in two hours and 23 minutes, eventually closing out the victory with a return winner on his seventh match point.

"I'm very happy because it was tough at the end," Schwartzman said. "He was saving too many match points, winning too many good points at the end of the match and he had the chance to go into the third.

"I think the tie-break, in the beginning, I played better than him. But at the end, he was fighting and he was there."

Casper Ruud began his Argentina Open title tilt with an impressively routine defeat of Roberto Carballes Baena.

The Norwegian, who is the top seed, saw off his opponent 7-6 (7-2) 6-3 to set up a quarter-final clash with home hopeful Federico Coria, who defeated Dusan Lajovic 4-6 7-5 6-4.

Ruud was taking to the court for the first time since being in ATP Cup action in early January, with ankle injury ruling him out of the Australian Open.

But on the scene of his maiden ATP title win in 2020, Ruud – who has won five tournaments since – looked in good shape.

"I feel, obviously, very good in Buenos Aires. I was a bit nervous coming back because it's the first time I have to defend a title," he said.

"Everything is a bit different since two years ago. When I won here it was a surprise. I was young.

"[This] was a good start. First time playing on clay in six months, so everything is a bit new again.

"Of course, I prefer to play on clay, but it takes some time to get used to the court and playing points."

Third seed Lorenzo Sonego also advanced through to the last eight in straight sets, the Italian beating Sebastian Baez 6-3 6-3 to set up a meeting with Fernando Verdasco.

Unseeded Spaniard Verdasco, seeking an eighth career title, progressed thanks to a hard-fought 2-6 6-3 7-5 win over Thiago Monteiro.

At the Dallas Open, John Isner won his opening match on home soil with a 7-6 (7-1) 6-7 (7-9) 7-6 (7-5) victory over Kevin Anderson.

Isner will next take on either Vasek Pospisil or Jurij Rodionov, with the qualifiers scheduled to meet on Thursday.

Marcos Giron and Jordan Thompson are also in the quarter-finals after seeing off Liam Broady and Brandan Nakashima respectively.

Juan Martin del Potro was reduced to tears in what he expects to be his final tennis match as the former US Open champion bowed out of the Argentina Open.

The 33-year-old Argentinian lost 6-1 6-3 to fellow Argentinian Federico Delbonis in Buenos Aires, having come back from four rounds of knee surgery to get back on court.

He saved seven of 12 break points in a determined effort against Delbonis, but Del Potro, who had been on the injured list since June 2019, was in no shape to compete for victory over his compatriot.

One of the most popular players on the tour, who might have achieved many more great things had wrist and knee trouble not played him over the last decade, Del Potro bid an emotional farewell.

The moment got to Del Potro as he prepared to serve at 5-3 down in the second set. His emotions spilled out, with a towel failing to mask his tears as a passionate crowd rallied behind him, chanting: "Ole, ole, ole, ole, Delpo, Delpo."

A fan carried a flag bearing the message: "The Tower of Tandil keeps fighting. Thank you." Tandil is Del Potro's home city.

After the match, Del Potro said: "The truth is that this is a moment I never wanted to come. Health leads me to have to make a decision: I made too much effort in these two and a half years.

"Sometimes I can lose. I do not have the strength that everyone believes. I think I fulfilled all the dreams in tennis and the most difficult thing to achieve, which is the affection of the people.

"I feel like I've given it all. This is a day I never wanted to come, but I'm going to remember it for the rest of my life."

He was relieved to be leaving on his own terms, saying: "Now I am calm because my last match was possibly on the court and not in a press conference. I will always remember this."

Del Potro, whose US Open triumph came when he beat Roger Federer in a sensational 2009 final, has accepted a wildcard to the upcoming Rio Open, but he signalled he is unlikely to now take that up.

"Yes, I was planning to go to Rio," he said, quoted by La Nacion. "But... I think I already gave everything until the last point."

Del Potro was an Olympic silver medallist in 2016, beaten in the Rio final by Andy Murray, and later in the same year he helped Argentina win the Davis Cup.

It was fitting that Delbonis, who won the decisive rubber against Croatia after Del Potro was victorious in both his singles matches, was the man on the other side of the net on Tuesday. He and Del Potro shared a long, affectionate hug at the net at the end of the match.

Del Potro's mother, Patricia, was among those in the crowd. The ATP said it was the first time she had attended one of his matches. She was pictured embracing her son off court after the match ended.

Other matches happened in Buenos Aires on Tuesday too, a highlight being Brazilian Thiago Monteiro's 6-3 6-3 win over seventh seed Albert Ramos-Vinolas.

At the Dallas Open, first-round winners included Jack Sock, Jordan Thompson and Liam Broady.

Alexander Bublik claimed his first ATP Tour title with a stunning straight-sets victory over Alexander Zverev in the Open Sud de France final.

The 24-year-old went into Sunday's match without a career win over a top-five opponent and having lost two finals in a career-best season in 2021.

He was not to be denied this time, however, powering his way to a 6-4 6-3 win over the world number three in Montpellier in just one hour and 10 minutes.

The Kazakhstani lost just four points behind his first serve throughout the match, the only blip coming when he handed Zverev a break back to love after moving 3-2 ahead in the first set.

After regaining the advantage, Bublik survived two more break points before closing out the opener and the pressure only increased on the Zverev serve in the second set.

Bublik broke to love to lead 3-2 and again in the final game as Zverev's resistance wilted.

He can now look forward to rising to a career-high place in the rankings when the updated list is published on Monday.

Joao Sousa won his first ATP Tour title since 2018 as he defeated Emil Ruusuvuori in the final of the Tata Open Maharashtra in Pune on Sunday.

Ruusuvuori initially gave a good account of himself in his first final on the tour, but he was ultimately blown away in the final set as Sousa won 7-6 (11-9) 4-6 6-1.

After sealing the first set in a tense tie-break, Sousa appeared set to cruise to victory when an early break in the second had him 3-0 up.

But Ruusuvuori then won five games in a row at 4-1 down to fight back brilliantly and force a decider.

Sousa had too much for him in the end, however, an early break in the third set seeing momentum shift the 32-year-old's way and give him the boost he needed to claim a first title since winning on home soil in Estoril in May 2018.

Alexander Zverev will face Alexander Bublik in the Open Sud de France final after easing to victory over Mikael Ymer on Saturday.

The top seed is seeking a 20th tour-level title and has yet to drop a set in his three matches in Montpellier after beating Bublik 6-1 6-3.

Ymer eliminated Gael Monfils and Richard Gasquet en route to the semi-finals, but the world number 83 struggled against Zverev in his third straight loss to the German. 

Zverev was triumphant in his last appearance in this tournament five years ago and is the strong favourite heading into Sunday's final with Bublik.

"I am in the final and I am happy about that," Zverev said in his on-court interview. "I played a pretty good match. I think I played one bad game in the whole match. 

"Overall I am happy to be in another final, playing against Alex who I have known since I was 12 years old, so hopefully it will be a fun match."

Bublik also claimed a routine win in his semi-final against Filip Krajinovic, the sixth seed prevailing 6-4 6-2 in a little over an hour.

The 24-year-old is through to his fifth ATP Tour final, having most recently gone all the way at the Singapore Open last February, where he lost to Alexei Popyrin.

At the Tata Open Maharashtra, Mikael's older brother Elias Ymer squandered three match points to lose 5-7 7-6 (7-4) 7-5 to Joao Sousa in Pune.

The Swedish qualifier had defied the odds to make it to the semi-finals and took the opening set against Sousa, before recovering from 4-1 down to level up the second set 4-4.

But Sousa edged the tie-break and survived three match points in the 10th game of the deciding set, which he would go on to win.

Sousa will face Emil Ruusuvuori in Sunday's final after the world number 87 overcame Kamil Majchrzak 6-3 7-6 (7-0) earlier in the day.

It marks the first tour final that Ruusuvuori has reached, while Sousa is in the hunt for a fourth title at this level.

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