Dominic Thiem is relishing Roger Federer's return to action, with the duo taking part in this week's Qatar Open.

Federer has spent the last 13 months out, having elected to take 2020 off – following last year's Australian Open – to undergo two knee operations.

The 40-year-old will compete in Doha this week, returning to play in an event where he has enjoyed plenty of success down the years, winning the tournament three times.

Last year's US Open champion Thiem, who has moved above Federer in the world rankings during the Swiss' absence, will also be in action in Qatar, and is thrilled to see the 20-time grand slam winner make his comeback.

"We are rivals, and of course we want to beat each other in the tournament, [but] I still really love to watch him play tennis," said top seed Thiem, who was speaking to Laureus Sport after his nomination for Breakthrough of the Year.

"[He] looks so nice, the way he plays, the way he approaches the game of tennis.

"On the one hand, I'm also a big fan of his still, and that's why I really love that he's back and that I can watch him again. That's what pretty much everybody is thinking, and I hope that he's coming back strong, as well."

Federer and Thiem have met seven times, with the Austrian holding the advantage, with five wins to his name against the former world number one.

Thiem, a semi-finalist in Doha in 2018, has not played since he lost to Grigor Dimitrov at the Australian Open in mid-February, and the world number four is hoping to make a fast start when he takes on Aslan Karatsev in round two.

"The [Doha] draw is unbelievably strong, so [you] never know what's [going to] happen, but I just try to have a good start and to be there on a good level from the very first point," said Thiem.

"It's going to be my first tournament and [my] first match [in almost] a month, since [a] pretty devastating loss at the Australian Open.

"I needed some time to digest everything, to analyse everything [and] to settle down a little bit. Now it's time to focus on new things. The tournament in Doha is the first chance to play better again, to get good results, to get confidence and to forget a pretty tough start of the season."

Elena Rybakina, the 2020 finalist, eased through her Dubai Tennis Championships opener on a second day dominated by the seeds.

Rybakina was beaten in last season's Dubai decider by Simona Halep, one of five WTA Tour finals she reached in a breakout year.

The Kazakh, with two career titles to her name, has not played a final since September, however, and entered this week's tournament with a 4-4 record for 2021.

But her fine form in Dubai continued with a straightforward first match, beating Zheng Saisai 6-0 6-4 in 73 minutes.

"I lost a bit of concentration in the second set," number 14 seed Rybakina said. "Also Saisai played well - she decided to risk stepping in on the returns - so overall I think it was not a bad match."

Garbine Muguruza also built on a final defeat, having come up short in Saturday's Qatar Open decider, thrashed by Petra Kvitova.

Including that event, Muguruza has reached the showpiece match at two of the four tournaments she has entered prior to this latest campaign, which began with a 6-3 7-5 win over Irina-Camelia Begu.

Fellow seeds Madison Keys, Marketa Vondrousova and Anett Kontaveit each also raced through in straight sets.

Petra Martic could not join them, however, going down 7-6 (7-2) 6-4 to Kristina Mladenovic.

Meanwhile, Jessica Pegula continued her rich vein of form in a dominant 6-2 6-1 defeat of Yaroslava Shvedova.

The American reached the quarter-finals of the Australian Open and the last four as a qualifier in Qatar, meaning she is now 11-2 since heading to Melbourne.

One-time French Open winner Jelena Ostapenko also triumphed, while former Roland Garros semi-finalist Amanda Anisimova, still just 19, made a victorious 2021 WTA bow.

But three-time grand slam champion Angelique Kerber continues to struggle for momentum, letting a set lead slip to lose to Caroline Garcia.

LeBron James said he is "in awe" of Giannis Antetokounmpo and Steph Curry after they put on a show for his side in the NBA All-Star Game on Sunday.

Antetokounmpo was named MVP after shooting a perfect 16 from 16 to claim a game-high 35 points in a 170-150 victory for Team LeBron over Team Durant.

Greek star Antetokounmpo recorded the most baskets without a miss in All-Star Game history, while Curry finished with 28 points in the 70th edition of the showpiece match at State Farm Arena, Atlanta.

James, who scored just four points in his 12:46 minutes on court, relished the opportunity to line up with Antetokounmpo and Curry.

Asked if he enjoyed playing in the same team as the duo, he replied: "Absolutely, that's why I drafted them, guys I obviously compete against on a nightly basis, but guys I'm just in awe of, Giannis and Steph.

"It's my first time teaming up with Steph and it was an honour to be on the floor with him, a guy I've seen come up and be the player that he is today, but it was great to be out there with them and the rest of the guys."

That is four wins out of four for James as captain in the All-Star Game and the 36-year would be happy to keep it that way.

"I hope they allow me to retire from being an All-Star captain, retire with a perfect 4-and-0 record, I'll keep that forever, but we'll see what happens," said the Los Angeles Lakers great.

"I try to pick the right team, guys who compete, and play to win, and I've been on the winning side of all four."

Giannis Antetokounmpo insisted he was not thinking about his perfect performance in the NBA All-Star Game after going 16-for-16 from the field to fuel Team LeBron past Team Durant.

Antetokounmpo was crowned All-Star MVP after posting a game-high 35 points in Sunday's 170-150 victory over Team Durant in Atlanta.

Milwaukee Bucks star and two-time reigning NBA MVP Antetokounmpo did not miss a shot, joining Wilt Chamberlain as the only players in history to go 16-for-16 or better from the field in any game (regular season, playoffs or All-Star Game), per Stats Perform.

It was also the most makes without a miss over an entire All-Star game. The previous record was held by Hal Greer going eight-for-eight in 1968.

"It actually wasn't [on my mind]," Antetokounmpo said of the perfect performance. "I was just trying to just play.

"When you're around guys like [Damian Lillard] and [Stephen Curry] and Chris Paul, it's just easy. Nobody is worrying about me. I'm just playing one-on-one, nobody is double-teaming.

"If you feel good, then I feel good that it will be good. I just get up and have fun and just try to get as many shots as I can."

Team LeBron – without Joel Embiid as he joined Philadelphia 76ers team-mate and Team Durant's Ben Simmons in sitting out due to COVID-19 contact tracing – entered the fourth quarter requiring only 24 points to seal victory under the Elam Ending rule.

Each of the first three quarters started with the score at 0-0 and lasted the standard 12 minutes, with the game clock turned off for the final period and a final target score set.

Team LeBron's Damian Lillard sealed the victory with a three-pointer – the Portland Trail Blazers guard posting 32 points.

Afterwards, Antetokounmpo was named All-Star Game Kobe Bryant MVP – the award named in honour of the Los Angeles Lakers and NBA great, who died in a helicopter crash last year.

"Obviously, I'm extremely happy at just having the award with the name of Kobe Bryant in my house," Antetokounmpo said.

"It's a great feeling. I wanted to win the one last year really bad and I had a chance to win because I felt like I wanted to have the trophy in my house, but this year I wasn't even thinking about winning it, I was just thinking about having fun, and I had the opportunity to play well.

"My team played great and I was able to just win it and to have the trophy with the name of Kobe Bryant, it's amazing, and I know he would be happy. Yeah, I know he'd be happy."

Former world number one Roger Federer said he has no real expectations for his comeback event at the Qatar Open.

Federer has not played competitively since his semi-final exit at the 2020 Australian Open – the 20-time grand slam champion having undergone knee surgery last year.

The 39-year-old Swiss superstar opted not to travel to Melbourne for this year's Australian Open, but he is set to make his comeback in Doha.

Federer, who holds the record for most Qatar Open titles with three – will start his campaign against either Jeremy Chardy or Daniel Evans at the ATP 250 tournament.

"It's been a long year in some ways, especially rehabbing, being on crutches once and then for a second time, and finally I'm back on a tennis court again, working out, playing sets, playing points," Federer said.

"It's a true pleasure, it's a privilege actually after all this time. I didn't expect it to go as long as it did, we are where we are, I'm so excited to be back on a match court, you know, in a few days here.

"I'm really curious to find out how it's going to go, obviously there's an amazing amount of questions marks surrounding my comeback for me personally.

"I don't know what to expect, I know that expectations from myself are extremely low, and I'm just very happy that I'm playing a tournament again, regardless of the outcome of this event."

On whether he had doubts over returning, Federer added: "You always do have doubts, you know, when you have surgery, there are always days when you feel better and worse. But I think overall I am a very positive person, I have a great team around myself, my family, I am also very distracted, and you know, the idea was to be fully fit again, one day. For life or for tennis.

"So equally important to me, actually life is a little bit more important to me, I wanna go skiing and play basketball, I wanna go playing ice hockey, play tennis in the future, with my children or exhibition matches, you name it, so it's definitely worth it to go through all that pain you know. But the goal was, this is not I'm going to go out, I'm not happy with my knee, we're going to fix it, and then I'm going to come back.

"For me there was no other story to it, and rehab wasn't as hard as maybe people make it seem, even though people around me are very impressed how I go about it, but for me it's only but normal to be really, really professional about it."

Novak Djokovic made history after breaking Roger Federer's record for most weeks as world number one on the ATP Tour.

Djokovic surpassed Federer after beginning his 311th week as the number one player in the men's rankings on Monday.

Serbian star Djokovic reclaimed the top ranking from fellow superstar Rafael Nadal in February 2020 and finished as year-ending number one for the sixth time – tying the mark set by Pete Sampras.

Djokovic, who first topped the men's rankings in July 2011, went on to celebrate a record-extending ninth Australian Open title at Melbourne Park in February.

With Federer turning 40 in August and Nadal a year older, the 33-year-old Djokovic has time on his side in pursuit of more history.

Djokovic has won 18 grand slams, two adrift of Federer – who is set to make his long-awaited ATP comeback in Qatar this week – and Nadal.

"I think it's an ultimate challenge to be honest, of course, winning a slam and being in history, the longest-ever number one," Djokovic said in Melbourne last month.

"You can have a great grand slam, a great tournament, a great couple of months, or even a great season but to do it over and over again, to be actually contender for historic number one, you need to play well and have a consistency from January to November, ever single year.

"I've been fortunate to do that and put myself in a position to make history in that regard. I'm very, very proud of that and privileged to be in that position.

"It's also a relief because it has been definitely my main goal, other than winning slams and now that I'll be managing to achieve it, I'll focus myself more on slams and adapt my calendar and schedule because when you're going for number one, you have to play all year and you have to play all the biggest tournaments.

"You can't allow someone else to earn more points than you. It's like a constant pressure, I think, and expectations that you have to deal with. It's definitely fulfilling to achieve that."

Federer now sits sixth in the rankings, having not played competitively since the 2020 Australian Open.

Nadal remains second, though he is set to be leapfrogged by Australian Open runner-up Daniil Medvedev in the next rankings release on March 15.

Russian Medvedev will be the first player, other than Djokovic, Nadal, Federer and Andy Murray, ranked in the top two since July 2005.

Giannis Antetokounmpo added another MVP award to his growing collection as the Milwaukee Bucks superstar guided Team LeBron to a 170-150 victory over Team Durant in Sunday's All-Star Game.

The previous three All-Star contests had pitted LeBron James against Antetokounmpo in a mouth-watering Team LeBron versus Team Giannis matchup.

But James and Antetokounmpo joined forces for this year's 70th All-Star Game as the later fuelled Team LeBron to a comprehensive win in Atlanta.

Two-time reigning NBA MVP Antetokounmpo – drafted first by Los Angeles Lakers superstar James – led Team LeBron to a fourth consecutive All-Star triumph behind his game-high 35 points on 16-for-16 shooting.

Antetokounmpo joined Wilt Chamberlain as the only players in NBA history to go 16-for-16 or better from the field in any game (regular season, playoffs or All-Star Game), per Stats Perform. Chamberlain accomplished the feat twice in the regular season in 1966-67 (18-for-18 and 16-for-16).

Antetokounmpo's performance earned All-Star Game Kobe Bryant MVP honours for the first time in his career.

Team LeBron – without Joel Embiid as he joined Philadelphia 76ers team-mate and Team Durant's Ben Simmons in sitting out due to COVID-19 contact tracing – entered the fourth quarter requiring only 24 points to seal victory under the Elam Ending rule.

Each of the first three quarters started with the score at 0-0 and lasted the standard 12 minutes, with the game clock turned off for the final period and a final target score set.

Team LeBron's Damian Lillard sealed the victory with a three-pointer – the Portland Trail Blazers guard posting 32 points.

Stephen Curry, who won the Three-Point Contest as All-Star proceedings were condensed into one day amid the coronavirus pandemic – had 28 points for Team LeBron, including eight three-pointers in 22 minutes.

Jaylen Brown was next best for Team LeBron, while James tallied four points, four assists, two rebounds and a block in 13 minutes of action and Chris Paul posted six points and 16 assists.

Bradley Beal (26), Kyrie Irving (24 and 12 assists), James Harden (21), Jayson Tatum (21), Donovan Mitchell (15), Zach Lavine (13) and Zion Williamson (10) all had double-digit points for Team Durant.

Portland Trail Blazers guard Anfernee Simons was crowned the 2021 NBA Slam Dunk champion on Sunday.

This year's All-Star Game Slam Dunk Contest was a lot different in more ways than one in Atlanta.

It took place at half-time of the All-Star showdown and was lacking in star power, with just three participants – Simmons, Obi Toppin (New York Knicks) and Cassius Staley (Indiana Pacers).

In a condensed format, first-time participant Simons dazzled at State Farm Arena, where he defeated New York's Toppin in the final to win the title.

Simons' self-lob, where he attempted to kiss the rim but fell just short, was chosen by the judges via a 3-2 vote ahead of Toppin.

Toppin had opted for a between-the-legs effort from just inside the free-throw line.

Indiana Pacers star Domantas Sabonis upstaged Luka Doncic and Chris Paul to win the NBA Skills Challenge.

Sabonis defeated Orlando Magic center Nikola Vucevic in Sunday's final, ahead of the All-Star Game in Atlanta.

After losing to Miami Heat star Bam Adebayo in last year's decider, Sabonis went all the way in 2021 in a competition testing ball-handling, passing and shooting ability.

"I just wanted to come out here and have fun with," Sabonis said on TNT after the win.

Sabonis eased past New York Knicks All-Star forward Julius Randle in the opening round before stunning Mavericks star Doncic in the semi-finals in another flawless victory.

Vucevic topped veteran star Paul of the Phoenix Suns, but he was unable to stop Sabonis – who nailed a three-pointer on his fourth attempt for the title.

Blake Griffin has cleared free agency waivers and is set to join Kevin Durant, James Harden and Kyrie Irving on the Brooklyn Nets, according to reports.

The Athletic reported six-time All-Star Griffin was expected to link up with the NBA's latest 'big three' after leaving the lowly Detroit Pistons.

The 31-year-old, whose deal in Detroit was set to run until 2022, agreed a contract buyout with the Pistons earlier this week.

Griffin was tipped to join a contender, with the Golden State Warriors, Miami Heat and Portland Trail Blazers mentioned alongside the Nets in initial reports.

But the star-studded Nets will seemingly get their man as they boost a roster that already includes three 2021 All-Stars.

The 24-13 Nets – second behind the Philadelphia 76ers in the Eastern Conference – had been expected to add size after Jarrett Allen left in January as part of the blockbuster three-team trade that saw former MVP Harden arrive from the Houston Rockets.

Allen is now playing for the Cleveland Cavaliers, where Andre Drummond – one mooted option – has sat out of action ahead of a potential move.

But Brooklyn are instead making Griffin their newest recruit, hoping he can stay fit for an extended period having played just 38 games since the start of last season.

Griffin has averaged 12.3 points, 5.2 rebounds and 3.9 assists in 20 games this season for the Pistons (10-26), bottom in the east and only behind the Minnesota Timberwolves (7-29) for the worst record in the league.

Those numbers are down on his career average, including 8.7 boards per game, the same mark that Harden has reached for the Nets this season – a team-high among those still on the roster.

Brooklyn rank 14th in the league with 44.3 rebounds per game in 2020-21.

Diego Schwartzman claimed his first ATP Tour title on home soil as he defeated qualifier Francisco Cerundolo in the final of the Argentina Open on Sunday.

After losing in his two previous finals in Argentina, Schwartzman finally came good in his home city of Buenos Aires with a 6-1 6-2 victory. 

The world number nine was in complete control from the off, breaking six times and conceding on his serve just once as he took just 81 minutes to wrap up a fourth Tour title.

Cerundolo's run to the final had at least ensured that whoever came out on top in the showdown would result in the first Argentine champion of the competition since 2008, when David Nalbandian triumphed in a clash with compatriot Jose Acasuso.

"I'm very, very happy, it's been an amazing week for me," Schwartzman said in the trophy presentation.

"It's the first time that [I have won at] home. Two years ago, I reached the final here and lost. I was very unhappy, but two years later I have my revenge against Francisco who is a great player."

Danish teenager Clara Tauson landed a first WTA Tour title as the former junior world number one triumphed at the Lyon Open on Sunday.

The 18-year-old beat Swiss opponent Viktorija Golubic 6-4 6-1 in a final contested by two qualifiers, achieving her breakthrough win in an hour and 29 minutes.

Golubic saved five match points but eventually was put away by Tauson, who has spent most of her senior career to date on the second-tier ITF tour.

She caused a major shock at the French Open in September by beating US Open semi-finalist Jennifer Brady in the first round, and Tauson should now become a more familiar presence at the higher level.

The win carries the youngster into the WTA top 100 for the first time, and it completed an impeccable trip to France that saw Tauson win all seven of her matches, including two qualifying rounds, in straight sets.

She said of her performance: "I think I've been really solid; especially after the first set, I've come out good in every single match."

Quoted on the WTA website, Tauson added: "I just kept my game going. It's been a weird week like that, normally I have some fall-outs, but I haven't had any of those this week, so I'm very happy with that."

Tauson shocked Russian top seed Ekaterina Alexandrova in the first round at the start of the week in Lyon, and Alexandrova lost to another teenager on Sunday as the Dubai Tennis Championships began.

The world number 33 was handed a tough draw against American Coco Gauff, who scraped through 7-6 (7-3) 2-6 7-6 (10-8) in a match lasting two hours and 41 minutes.

Gauff served 12 double faults, including seven in the deciding set, but found a way through to the second round.

Svetlana Kuznetsova, Ons Jabeur and Alize Cornet were among the other winners on day one. The top eight seeds, who include Iga Swiatek, Karolina Pliskova, Elina Svitolina and Petra Kvitova, have all received byes to round two of the WTA 1000 event.