Former US Open champion Sloane Stephens has continued her torrid start to 2021 after crashing out in the first round of the Monterrey Open on Tuesday.

Stephens went into the Mexico event as top seed but lost to Slovakian world number 151 Kristina Kucova 6-2 6-2.

The 27-year-old American is now 0-4 to start the 2021 WTA Tour season and has won only one set all season.

Stephens, now ranked 48th in the world, only managed to win 32.4 per cent of points on her first serve, with Kucova converting seven of 14 break points in the match.

Second seed Nadia Podoroska was also a first-round casualty on Tuesday, going down 6-4 6-4 to Russian qualifier Anna Kalinskaya.

In the late match, Eugenie Bouchard went down to China's Lin Zhu 7-5 7-6 (6-3).

Matteo Guendouzi insists his Arsenal career is not over and he wants to fight his way back into Mikel Arteta's plans next season.

Guendouzi, 21, has been on loan with Hertha Berlin since last October where he has made 19 appearances for the Bundesliga club.

The French midfielder was a regular starter with the Gunners under previous boss Unai Emery but failed to make an appearance for Arteta's side in the opening weeks of the season prior to securing a temporary move away.

When asked if his Arsenal career was over due to an apparently strained relationship with Arteta, Guendouzi was emphatic in his response.

"No, not at all," he told France Football.

"I am focused on my season at Hertha Berlin. Then, we will make a point with my agent and the people of the club to sit down and discuss the future. I am still an Arsenal player."

Guendouzi joined Arsenal from Lorient in 2018 and has made 57 Premier League appearances for the Gunners, registering just one assist and no goals in the competition.

In those games he attempted a total of 75 tackles, the third-most among Arsenal players across 2018-19 and 2019-20, while his 263 duel wins over the same period was only bettered by four of his team-mates.

His contract with Arsenal expires at the end of next season and he acknowledged his long-term future will be at stake when he returns to the Gunners.

"This summer will be a decisive moment," he added.

"Could I come back to the club with Mikel Arteta on the bench as coach? Yes, of course. I will be with Arsenal for another year.

"I am here to move forward. When I played for Arsenal, I have always given everything for this club, for these fans, for the team, for the staff. I will work hard for the jersey as usual."

Top seed Dominic Thiem was beaten in straight sets in the second round of the Dubai Tennis Championships by Lloyd Harris.

The reigning US Open champion, given a bye for the first round, lost 6-3 6-4 to his South African opponent, who sits 77 places further down the ATP rankings.

The Austrian has endured a difficult start to 2021. He lost in straight sets to Grigor Dimitrov in the last 16 of the Australian Open and was beaten by Roberto Bautista Agut in the quarter-finals in Doha.

It was a first win over a top-five player for Harris, who was not once taken to deuce on serve during their 72 minutes on court.

"I'm super, super happy with that win. [He is] by far the highest-ranked player I have beat," said Harris. "I look up to Domi a lot so, for me, it is a special feeling. I am really happy. Just the fact that I am playing good tennis, match in, match out now is giving me a lot of confidence.

"I was serving really well. I don't think I faced any break points. I took control of those games and [in] one or two games on his serve, I gave myself a good look. I played some of the important points very well. I am very proud of that."

While Thiem is struggling for form, things are looking far better for Andrey Rublev, who beat Emil Ruusuvuori 6-4 6-4 to stretch his winning streak at ATP 500 events to 21 matches.

The world number eight, who will face Taylor Fritz in the next round, equalled Andy Murray for the second-best winning run at this level of the Tour. Roger Federer (28) holds the record.

Third seed Denis Shapovalov beat Jan-Lennard Struff for the loss of just four games, while Bautista-Agut advanced after opponent Matthew Ebden retired in the first set.

Fifth seed David Goffin was beaten in straight sets by Kei Nishikori, who recorded just his third victory of the year.

Karen Khachanov and Jannik Sinner each advanced after three-setters, while Marton Fucsovics and Aslan Karatsev were also taken the distance before progressing.

Hubert Hurkacz, Lorenzo Sonego, Dusan Lajovic, Aljaz Bedene and Filip Krajinovic also won on Tuesday.

Juan Bernat has signed a new four-year contract with Paris Saint-Germain.

The left-back is nearing the end of his third season with PSG having signed from Bayern Munich in 2018.

Bernat, 28, was due to be out of contract at the end of 2020-21 but will now be tied to PSG until June 2025.

He has not played since last September due to an ACL injury.

PSG sporting director Leonardo had publicly stated he was targeting four big contract renewals for the French champions – Angel Di Maria, Bernat, Neymar and Kylian Mbappe.

Di Maria and Bernat are done, meaning the attention moves fully to the two star forwards, particularly with huge speculation the club will pursue Lionel Messi when his Barcelona contract expires at the end of the season.

"I am very happy to have been able to extend my contract with Paris, I have always said that I feel good here," Bernat said after his new deal was announced on Tuesday.

"I really wanted to continue my adventure with the club, it's now happened and I am very happy about it.

"It's a bit of everything, it's the club, it's the affection that everyone shows me here, the supporters, my team-mates. 

"There is a really exciting project here and I am happy to be a part of it.

"I think that we can achieve great things together, that's one of the reasons that I wanted to continue my time here at the club, and I hope to be able to play here for several more years."

Bernat is hoping to return before the end of the season, with PSG three points behind Lille at the top of Ligue 1 and in the Champions League quarter-finals.

The Valencia youth product added: "The league is very tight this year, we are just three points behind the leaders and I hope we will make up these points. 

"I also hope to be available for the final games and to help the team. For the moment, we can only think about working hard and winning each match."

Daria Kasatkina fended off fast-rising star Clara Tauson at the St Petersburg Ladies Trophy as the Russian home favourite edged a clash of recent tournament winners.

Former world number 10 Kasatkina, who landed the Phillip Island Trophy title in Melbourne last month, came through a roller coaster second set against the qualifier to tie up a 6-4 7-6 (7-0) first-round victory.

Former junior world number one Tauson won the Lyon Open at the start of March, and the 18-year-old Danish player twice broke when Kasatkina was serving for the match to take their tussle to a tie-break that was then unexpectedly one-sided.

Having been jittery when serving at 5-4 and 6-5, Kasatkina found composure when it mattered to see out the match.

Tauson had won 13 consecutive matches, including qualifiers, and had reeled off 20 successive sets during that run, but Kasatkina interrupted the hot streak.

Three-time WTA tournament winner Kasatkina, seeded eighth this week, said on Amazon Prime: "You're right, I was nervous serving for the match, but I'm glad I could close out the match playing the tie-breaker.

"Sure, there is something to improve, but I don't want to talk about it right now. I'm going to talk to my coach about what I need to improve. She wasn't an easy opponent. She just won a tournament and I knew it was going to be a tough match, and a tough match it was."

Two 19-year-old qualifiers were also among Tuesday's winners, as Chinese player Wang Xinyu and Russian Kamilla Rakhimova safely went through to the last-16 stage.

Rafael Nadal has withdrawn from the Miami Open as he bids to recover full fitness in time for the European clay season.

The 20-time grand slam singles champion has not played since losing to Stefanos Tsitsipas in the quarter-finals of the Australian Open in February.

Nadal pulled out of the Rotterdam Open and turned down a wildcard for the Dubai Tennis Championships due to a persistent back problem.

The world number three, who has never won the title in Miami, wants to prioritise his recovery ahead of the beginning of the clay-court swing in April.

Writing on Twitter on Tuesday, he said: "Sad to announce that I won't be playing in Miami, a city that I love.

"I need to fully recover and get ready for the clay-court season in Europe. Special message to my fans in the US and in particular to the great Spanish-speaking community FL who always give me a great support!"

Nadal follows long-time rival Roger Federer in withdrawing from the tournament, the Swiss great choosing to focus on training after only returning to the Tour from a 14-month absence at the Qatar Open.

Federer is the reigning champion in Miami, having beaten 2018 winner John Isner in the final two years ago. The 2020 tournament was cancelled due to coronavirus concerns.

A resurgent Leroy Sane has his sights set on achieving his "huge" career goal of experiencing the Champions League glory his Bayern Munich team-mates enjoyed last season.

The winger joined Bayern from Manchester City after they had tasted European success by defeating Paris Saint-Germain in the final.

Sane had a mixed start at Bayern, in and out the line up as he worked his way back from a long-term injury that restricted him to two appearances in his final season at City.

The 25-year-old has looked like his old self of late, registering either a goal or assist in four of his last five matches, including a strike in Bayern's emphatic 4-1 away win in the last-16 first leg away to Lazio.

Bayern were four goals up after 47 minutes of that game, but ahead of Wednesday's home second leg against Lazio, Sane wants his team-mates to take nothing for granted, which would jeopardise his Champions League dream.

"[Winning the Champions League is] a huge goal of mine," said Sane.

"That is why I place so much value on delivering a good match on Wednesday and for the rest of the season.

"When we have Champions League matches, we need to always be well prepared and up for it. 

"All of us know that a lot can still happen. Just because we scored a few goals in the first leg doesn't mean that we are through. 

"Lazio have a strong team and things could backfire if we don't take it seriously.

"I'm feeling better and better, and have had time to get to know the team and how we play. We get along very well off the pitch as well. Everyone is prepared to work hard, which benefits us all.

"At first, you need to get to know the workings of a team. For me it was even harder, because I didn't have a rhythm after a long injury. 

"So I needed to find my own rhythm back at first. Now I feel a lot better and I have got to know the team better. That is one of the reasons why things have gone uphill for me lately."

Bayern are hosting Lazio for the first time in European competition.

None of the last 21 sides facing them away from home for the first time in the European Cup or Champions League have won (W20 D1) since Bordeaux triumphed 2-0 back in November 2009.

Head coach Hansi Flick hopes to have fitness doubts Manuel Neuer and Kingsley Coman available.

"Manu has a slight cold, and Kingsley is dealing with some muscle issues," he said. "We will have to wait and see, but we are hoping that both will be able to feature on Wednesday.

"We want to win this game [the second leg] as well. We're in the midst of a good run and want to continue it.

"Especially since we're at home, we really want to win to further build our self-confidence.

"We've delivered strong performances in the Champions League, as well as in the Bundesliga. Our current aim is to continue on in this manner."

Flick was not keen to discuss the Germany job, which will become vacant when Joachim Low leaves after Euro 2020, any further.

"I have said everything about this topic, but nothing has changed for me," he said. "I do not comment on the topic."

Since Flick took charge of the club, Bayern have won their six home games in the Champions League by an aggregate score of 18-3. 

However, only one of the previous six have come in the knockout stages of the competition – beating Chelsea 4-1 in the second leg of last season’s round of 16.

Lazio, meanwhile, have only won one of their last 15 away games in the Champions League (D5 L9).

The Serie A side are winless in the last eight matches of that run (D4 L4) and have not one away in the competition was back in September 2003.

Zlatan Ibrahimovic has been called up by Sweden for the World Cup qualifiers against Kosovo and Georgia, paving the way for him to play at Euro 2020 this year.

Ireland number eight CJ Stander has dropped a retirement bombshell by declaring he will quit rugby at the end of the season.

Stander said the Irish Rugby Football Union (IRFU) and his club, Munster, tried to talk him out of leaving the game.

But 30-year-old Stander, who won his 50th cap in Ireland's 27-24 win over Scotland on Sunday, could not be persuaded to make a U-turn.

The South Africa-born back-rower said: "All professional sports people are told 'you will know when the time is right to hang up your boots'.

"It’s a sentiment one cannot fully comprehend until that day arrives. For me, that time has come, and I hereby publicly announce my retirement from all forms of rugby.

"I will be available to represent Munster until 27 June 2021 when my contract expires, and for international duty, until the end of the mid-year Test window."

Stander, who came to Ireland at the age of 22, said rugby had "started to take an unfair toll on my family".

He qualified to play for Ireland by residency and made his debut in the 2016 Six Nations, going on to play for the British and Irish Lions on their tour of New Zealand a year later.

In 2018, Stander helped Ireland achieve a Six Nations Grand Slam, but now he says rugby must take a back seat.

"I asked myself whether I was still enjoying this enough to earn the continued support of Munster and Ireland, and to justify the sacrifices my family was making. From a performance perspective, the answer was yes," Stander said in a statement.

"But I always had the intent to retire while I was still playing some of my best rugby. I also knew I wanted my daughter Everli to grow up around her family in South Africa.

"When all these intentions and considerations intercepted each other during that training session, I discussed the implications thereof with [Munster] coach Johann van Graan and the Irish Rugby Football Union.

"I deeply appreciate that they tried to persuade me otherwise, but I knew it was time."

Real Madrid alarmed supporters with a medical bulletin declaring Rodrygo was injured again on Tuesday - before a hacker was blamed for publishing the false information.

Brazilian forward Rodrygo recently returned from a hamstring problem and has made three appearances in March.

Just hours before Madrid's crucial Champions League clash with Atalanta on Tuesday, Madrid's website carried a statement that said: "After the tests carried out on our player Rodrygo by the Real Madrid medical services, he was diagnosed with a muscle injury affecting the tendon in the right biceps femoris."

However, that news of the injury recurrence was soon pulled down and replaced by a message stating: "We're sorry... but we have been unable to find the page you requested."

The surprising initial announcement, issued in the way Madrid typically declare injury updates, caught the eye of Spain's main sports news outlets.

There was no official clarification from Madrid on how the news came to be announced; however, Marca and AS cited club sources claiming that Madrid's Twitter account and website had been hacked.

Speaking on Monday, Zinedine Zidane enthused about Rodrygo, saying: "He's a player who has adapted well to our league. He's one for the present and the future and he's improving a lot.

"We're happy with him and we know the quality he has, especially with the ball. We have to let him continue with his normal development, but we're very happy with him."

Lionel Messi was hailed as "the magical one" after he matched Xavi's appearances record for Barcelona and marked the achievement with a double strike against Huesca.

The Argentine great played his 767th game for Barca on Monday and will set an outright record if he faces Real Sociedad on Sunday.

Former Barcelona team-mate Arturo Vidal wrote on Instagram: "One more record brother @leomessi. You are the master of football. You are the best, the extraterrestrial, the only one, the magical one."

Vidal, who left Barcelona to join Inter last September, added: "Surely you will continue to beat many more records, you are unique, an extraterrestrial hug ..."

Xavi, currently coach of Qatari champions Al Sadd, paid his own compliment on Tuesday by writing to his former team-mate: "Congratulations Leo!! It's an honor that you match this record."

The 4-1 win over Huesca moved Barcelona to within four points of stuttering leaders Atletico Madrid, who have only won two of their previous five league games.

Both of Messi's goals came from outside the penalty area, and the club captain has made a habit lately of scoring from long range.

Stats Perform data shows that 36 per cent of his LaLiga goals last season (9 of 25) and 33 per cent this term (7 of 21) have come from outside the 18-yard box.

Those are the highest percentage rates he has achieved in his Barcelona career and appear to signal a change in his approach to the game as he approaches his mid-30s.

In the 2011-12 season, when Messi scored a career-high 50 LaLiga goals in 37 games, only three of those - or six per cent - came from outside the penalty area.

Six of his seven from long range this season have come in his last nine league games.

Messi turns 34 in June and reaches the end of his contract at the end of the season, with uncertainty over whether he will stay at Camp Nou.

Whether his goals are coming from inside or outside the penalty area, crucially they continue to flow from the club's record scorer, whom Barca would be loath to see depart.

Monday night's double means he has scored over 20 goals in a LaLiga campaign for a 13th consecutive season, an unprecedented feat.

Stephen Curry said it was "embarrassing" for the Golden State Warriors to crumble so woefully to the Los Angeles Lakers on the night he made franchise history.

A 128-97 loss came a day after the Warriors beat the Utah Jazz, with Curry, now the team's all-time assists leader, disheartened to be part of such a feeble showing.

For the Warriors it was another 20-plus point defeat, having suffered such losses to the Clippers and the Suns already in March.

Curry said: "We've got to play better. We have to develop a winning attitude every single night, and honestly, we've got to get sick of getting blown out, because that's embarrassing.

"We have to have some pride about how we're playing. You can lose games - that's going to happen - but not like that."

Curry added: "Winning is hard in this league. We all know that, and we all know you can't just show up, and momentum's not just going to carry just because you played well the game before.

"We talk about the margins and where we are as a team. If you want to beat the good teams, you can't have any cracks in the armour."

Curry scored a team-high 27 points and went past Guy Rodgers to become the player with the most assists in regular-season play for the Warriors, reaching 4,856 for his career with the team.

He had only two assists against the Lakers but has a career average of 6.6 per game, alongside a points average of 23.8.

"It's special. It's kind of a longevity award," Curry said of his new assists mark.

"But in terms of playing for the same franchise for 12 years and hopefully a lot longer, there's been some greats that have come through here for however long.

"And anytime you've done something or reached a level that is the top of the list for a franchise, it's pretty special. I wish it was under different circumstances obviously, with the game tonight.

"But I can take a second and appreciate that for sure, because a lot goes into that. I've had a lot of great team-mates over the years.

"Obviously I love to score, but the ability to set other guys up and assists only count if other people make baskets, so it makes it a pretty special record."

LeBron James said he takes pride in having a "triple-threat game" after closing on a landmark 100th career triple-double in the Los Angeles Lakers' rout of the Golden State Warriors.

The four-time MVP posted 22 points, 11 assists and 10 rebounds to help the Lakers to a 128-97 victory at the Chase Center on Monday, ending a two-game losing streak on the road.

It was the 98th time James had posted a triple-double in his legendary career and he spoke about what it meant to have so many weapons in his arsenal.

"For me, I've always wanted to have a triple-threat game," he told reporters.

"One where I can pass the ball. I love passing ball to my team-mates, giving those guys good looks.

"Being able to rebound, that's always important, rebounding wins championships as the great Pat Riley would say.

"And then being able to score a little bit too, that's probably the least out of the three for me, but being able to be out on the court and control the game in three facets of the game - it's always been important for me to do it in a win, the losses never mean much to me.

"To do it in a win and make an impact on the game, when it happens in the flow of a game that's what's more important."

James' performance was particularly important given the Lakers have been hit by injuries. Marc Gasol, Kostas Antetokounmpo (both health and safety protocols), Anthony Davis (strained right calf), Jared Dudley (torn MCL in right knee) and Alex Caruso (concussion protocol) were all unavailable for the defending champions.

Davis has been missing for a month but has been a vocal presence on the sidelines for the Lakers.

"I just think he's trying to lead any way possible, obviously he can't be on the floor and do things he does at a high level," James said of his team-mate.

"He's just giving his words to a lot of guys, being there for them, showing them things on the iPad, showing them films during course of a game, being as helpful as he can be to our ball team."