Leylah Fernandez reached the quarter-finals of the Monterrey Open with a battling three-set win over Qinwen Zheng.

Last year's US Open runner-up came through 6-1 4-6 7-6 (7-3) in two hours and 42 minutes to continue the defence of the title she won last March.

Fernandez won a marathon second game on her eighth break point and consolidated that break with a second to go 5-1 ahead in a one-sided first set.

She served out the opener at the third time of asking, but Zheng was beginning to find her feet in the contest and threatened the Fernandez serve early in the second set.

Zheng's first break points finally came at 5-4 and she took her chance to level the contest against the 19-year-old.

But Fernandez outlasted Zheng in a tense decider that went the distance after both players held serve, the second seed aggressively attacking her opponent to take the tie-break 7-3.

Fifth seed Camila Osorio ended the challenge of home hope Marcela Zacarias, meanwhile, the Colombian winning 7-6 (7-3) 6-3.

She will next face either top seed Elina Svitolina or Viktoriya Tomova in the last eight.

Brazil's Beatriz Haddad Maia was a 6-2 6-2 winner against Xinyu Wang and will contest a quarter-final against either Marie Bouzkova or Petra Martic.

Sara Sorribes Tormo was also a straight-sets winner in Wednesday's action, the fourth seed easing past Harmony Tan 6-2 6-2. 

Viktorija Golubic came from a set down to beat lucky loser Mai Hontama and move into the second round of the Lyon Open on Wednesday.

Third seed Golubic was given the run-around by Hontama in the first set before fighting back to win 1-6 6-4 6-4.

Golubic had to dig deep to secure a meeting with Vitalia Diatchenko, who beat Anna-Lena Friedsam, as Hontama's deft drop shots had given her a scent of pulling off an upset.

The Swiss broke six times and saved six break points, wrapping up a well-earned victory in two hours and 10 minutes.

Golubic's compatriot Stefanie Voegele bowed out at the second-round stage, losing 6-3 7-5 to second seed Sorana Cirstea.

Anna Bondar reached the quarter-finals when Katie Boulter retired due to injury after losing the first set 6-3.

Alison Van Uytvanck won the final match of the day, getting the better of Varvara Gracheva 6-2 6-4 to advance to the last eight.

Elina Svitolina said she "was on a mission" for Ukraine after earning a straight-sets win over Russian opponent Anastasia Potapova in the opening round of the Monterrey Open.

The top seed donned the yellow and blue colours of her homeland for Tuesday's match and eased to a 6-2 6-1 victory in a little over an hour in Mexico.

Svitolina only agreed to play her opener after tennis authorities announced a ban on Russian and Belarussian players competing under the name and flags of their countries.

And as Russia's invasion of Ukraine entered its sixth day, the 27-year-old produced an impressive performance that saw her win 73.5 per cent of her first-serve points.

Former world number three Svitolina, who will now face Bulgarian qualifier Viktoriya Tomova, had previously announced she will donate her prize money to the Ukrainian army.

"It's a special one because of what we are going through right now in Ukraine, it's terrifying," Svitolina told reporters. 

"It's been six days and all the Ukrainian tennis players and Ukrainians who are there, we have been really terrified with what is happening.

"For me, playing the match here, I'm not playing only for myself. I'm playing for my country, I'm playing for the help of the Ukrainian army and people in need. 

"I was focused. I was on a mission for my country. From the beginning, it was important to be ready for anything that comes my way."

Petra Martic is also through to round two after recovering from behind to beat third seed Madison Keys 4-6 7-6 (7-3) 6-3.

Marie Bouzkova awaits following the world number 81's 4-6 6-2 6-4 win against Sara Errani. Number eight seed Ann Li's participation in the tournament came to an end with a 6-2 6-1 loss to Wang Xinyu, who will now face Brazil's Beatriz Haddad Maia.

Novak Djokovic has confirmed his professional partnership with long-time coach Marian Vajda has come to an end.

Djokovic revealed the pair agreed to part ways last year following the ATP Finals in Turin.

Vajda served as part of Djokovic's team for 15 years, playing a pivotal role in the 20-time grand slam champion's glittering career.

"Marian has been by my side during the most important and memorable moments in my career," Djokovic said in a post on his official website.

"Together we have achieved some incredible things and I am very grateful for his friendship and dedication over the last 15 years.

"While he might be leaving the professional team he will always be family and I can't thank him enough for all he has done."

Vajda said: "During my time with Novak, I have been lucky to watch him transform into the player he is today.

"I will look back on our time together with immense pride and am so very thankful for the success we have achieved.

"I remain his biggest support on and off the court and look forward to new challenges."

Vajda was joined on Djokovic's team by former Wimbledon champion Goran Ivanisevic in 2019. Ivanisevic will continue working with Djokovic as he bids to add to his tally of major triumphs.

Djokovic, who is unvaccinated against COVID-19, missed the 2022 Australian Open after having his visa cancelled on "health and good order grounds", leading to his deportation.

Rafael Nadal's triumph in Melbourne gave the Spaniard the outright record for grand slam triumphs with 21.

Djokovic made his 2022 debut in Dubai last month, losing in the quarter-finals to Jiri Vesely. On Monday, he was usurped as world number one by Daniil Medvedev.

Russian and Belarusian players, including ATP world number one Daniil Medvedev, will still be able to compete on the Tours and at grand slams, but the International Tennis Federation (ITF) has suspended the countries' teams.

Russia's Medvedev was only crowned world number one for the first time on Monday, though that success came amid the backdrop of an ongoing conflict between his nation and Ukraine.

To widespread international condemnation, Russia invaded Ukraine on Thursday, with that conflict since escalating further. Belarus, meanwhile, was effectively used as a staging post for part of the invasion force, though Belarusian president Alexander Lukashenko has insisted the nation's military did not and will not play any part in any operation.

Governments and organisations around the world, including governing bodies within sport, have responded with strict sanctions against Russia and certain individuals with links to president Vladimir Putin.

On Tuesday, the governing bodies of tennis (the ITF, ATP, WTA and the four grand slam events) announced sanctions of their own.

While Medvedev and other Russian and Belarusian players, including Andrey Rublev and WTA world number three Aryna Sabalenka, will be allowed to play in tournaments on both the men's and women's Tours, and the four grand slams, they will have to compete under neutral banners, with the flags of each country banned.

However, the WTA and ATP combined event in Moscow, scheduled to take place in October, has been suspended.

Meanwhile, Russia and Belarus have had their memberships of the ITF revoked, while all ITF tournaments set to be held in those countries have been suspended indefinitely.

Russia hold both the Davis Cup and Billie Jean King Cup.

The immediate upshot of the decision is that Elina Svitolina, the Ukrainian who is top seed at the Monterrey Open, will play her first-round match against Anastasia Potapova on Monday.

Svitolina said earlier in the day that she would refuse to play against any Russian or Belarusian opponent unless all national emblems, flags and colours were removed.

However, prior to the joint announcement from tennis' governing bodies, Svitolina told ITV News: "There's been a lot of discussion.

"Today they will release a statement that they will remove the flags. So we are waiting just for the final confirmation about that. I will be playing tonight because my opponent is going to be under a neutral flag."

Svitolina has pledged to donate all of her prize money from upcoming tournaments to assist Ukraine's fight against Russia.

The statement from tennis' governing bodies read: "A deep sense of distress, shock and sadness has been felt across the entire tennis community following Russia's invasion of Ukraine in the past week.

"Our thoughts are with the people of Ukraine, and we commend the many tennis players who have spoken out and taken action against this unacceptable act of aggression. We echo their calls for the violence to end and peace to return.

"The safety of the tennis community is our most immediate collective priority. The focus of the WTA and ATP in particular in recent days has been on contacting current and former players, and other members of the tennis community from Ukraine and neighbouring countries, to check on their safety and offer any assistance."

Top seed Camila Giorgi was beaten in three sets by Caroline Garcia at the Lyon Open on Tuesday.

Italian Giorgi battled to take the first set but was pegged back by the home favourite before her game collapsed in a 5-7 6-4 6-0 defeat.

Dominant on serve in the opening set, Giorgi failed to take either of two break points at 3-2 up in the second set. She then won only one point in three consecutive games to allow Garcia to level.

The world number 29 earned just two points on serve in a one-sided decider as Garcia set up a last-16 clash with another Italian, Martina Trevisan.

Earlier, Russian Vera Zvonareva was comfortably beaten by seventh seed Alison van Uytvanck, who could await Garcia in the quarter-finals.

Zhang Shuai beat Kristina Mladenovic 7-6 (7-3) 7-5 to secure a match with Arantxa Rus, who defeated Danka Kovinic for the loss of just two games.

The top-ranked remaining player in the draw, world number 30 Sorana Cirstea, sealed a round-of-16 showdown with Stefanie Voegele after a comfortable 6-3 6-1 defeat of Mariam Bolkvadze.

US Open runner-up Leyla Fernandez cruised into the second round of the Monterrey Open after a straight-sets win over Anna Karolina Schmiedlova on Monday.

Monterrey Open defending champion Fernandez won 6-2 6-2 over the Slovakian, with the Canadian second seed dominant in all aspects as she triumphed in one hour and eight minutes.

In the longest match of the day, fourth seed Sara Sorribes Tormo needed more than three hours to edge Kamilla Rakhimova 7-5 6-7 (2-7) 6-1.

Fifth seed Camila Osorio defeated Magdalena Frech 6-3 7-6 (8-6), while Briton Heather Watson won 6-3 2-6 7-6 (7-4) over Jule Niemeier.

Harmony Tan, Marcela Zacarias, Viktoriya Tomova and Beatriz Haddad Maia were other winners on Monday.

Elina Svitolina will refuse to play Russian or Belarusian players unless tennis' governing bodies have them compete as neutral athletes in the wake of Russia's invasion of Ukraine.

The world number 15, who has committed to donating all of her prize money to Ukrainian military and humanitarian efforts, has been drawn against Russia's Anastasia Potapova in the first round of the Monterrey Open.

In a post on Twitter, Svitolina announced she would not contest that match or any other against players from Russia or Belarus unless the ATP, WTA and ITF follow the recommendation of the International Olympic Committee (IOC) and remove any reference to their national identities.

Russian president Vladimir Putin ordered an invasion of Ukraine last Thursday, with neighbouring Belarus effectively used as a staging post for Russian military.

Svitolina wrote: "I believe the current situation requires a clear position from our organisations: ATP, WTA and ITF. As such, we – Ukrainian players – requested to ATP, WTA and ITF to follow the recommendations of the IOC to accept Russian or Belarusian nationals only as neutral athletes, without displaying any national symbols, colours, flags or anthems.

"Accordingly, I want to announce that I will not play tomorrow [Tuesday] in Monterrey, nor any other match against Russian or Belarusian tennis players until our organisations take this necessary decision."

Svitolina saluted the likes of Daniil Medvedev, Andrey Rublev and Anastasia Pavlyuchenkova, Russian players who have all spoken out against the war.

She added: "I do not blame any of the Russian athletes. They are not responsible for the invasion of our motherland.

"Moreover, I wish to pay tribute to all the players, especially Russians and Belarusians, who bravely stated their position against the war. Their support is essential."

Alize Cornet crashed out on home soil as the Lyon Open got under way on Monday.

Fourth seed Cornet went down to a surprise defeat against Spanish qualifier Cristina Bucsa to disappoint the French support.

Bucsa, the world number 139, broke serve on six occasions as she came from behind to triumph 1-6 6-4 6-1 and dispatch Cornet, who was the highest-seeded player taking to the court on day one.

Fifth seed Jasmine Paolini almost joined Cornet in suffering an early exit at the WTA 250 event.

However, the Italian rallied to defeat Irina Bara 4-6 7-5 6-3 in a battle lasting two hours and 25 minutes.

Elsewhere, six aces helped Varvara Gracheva edge past Kristina Kucova in a 7-6 (7-0) 7-6 (7-2) win.

Paolini's compatriot Camila Giorgi is the number one seed at the tournament.

Giorgi is due to start her campaign on Tuesday after being handed a standout draw against home favourite Caroline Garcia.

Athletes and officials from Russia and Belarus should be prevented from taking part in all international sporting competitions, the International Olympic Committee said.

In a statement issued on Monday, the IOC's executive board accused the governments of Russia and Belarus of a "breach of the Olympic Truce" following the attack on Ukraine.

Russian president Vladimir Putin ordered an invasion of Ukraine last Thursday, with neighbouring Belarus effectively used as a staging post for Russian military.

The IOC accepted athletes from both countries did not deserve to be punished simply for the actions of their governments. However, because the war in Ukraine prevents many Ukrainians from taking part in sporting events, the IOC said they were left with "a dilemma which cannot be solved".

It added: "The IOC EB has therefore today carefully considered the situation and, with a heavy heart, issued the following resolution:

"In order to protect the integrity of global sports competitions and for the safety of all the participants, the IOC EB recommends that International Sports Federations and sports event organisers not invite or allow the participation of Russian and Belarusian athletes and officials in international competitions.

"Wherever this is not possible on short notice for organisational or legal reasons, the IOC EB strongly urges International Sports Federations and organisers of sports events worldwide to do everything in their power to ensure that no athlete or sports official from Russia or Belarus be allowed to take part under the name of Russia or Belarus. Russian or Belarusian nationals, be it as individuals or teams, should be accepted only as neutral athletes or neutral teams. No national symbols, colours, flags or anthems should be displayed."

The IOC's announcement is expected to hasten a decision from FIFA over whether Russia will be allowed to compete in the World Cup play-offs in March.

Poland, Sweden and the Czech Republic all declared they would not play against Russia due to the Ukraine conflict, but world football's governing body initially chose only to ban the country's anthem and flag from matches and order them to play as the Football Union of Russia (RFU).

Russian tennis player Daniil Medvedev was confirmed as the new leader of the ATP world rankings on Monday, becoming the first man since Andy Roddick in 2004 to become world number one other than Novak Djokovic, Roger Federer, Rafael Nadal or Andy Murray.

Daniil Medvedev has officially been crowned as the ATP's new world number one.

The Russian, who claimed his first grand slam title at the US Open last year and reached this year's Australian Open final, only to lose to Rafael Nadal, has been sure of his place at the top of the rankings since Novak Djokovic's shock defeat to Jiri Vesely in the Dubai Tennis Championships last week.

Medvedev was aiming to cap off a sensational week by claiming victory at the Mexican Open, but the 26-year-old lost to eventual champion Nadal in the semi-finals in Acapulco.

Here, Stats Perform looks at the numbers behind Medvedev's rise to number one.

1 - Medvedev is the first player outside of the "big four" of Djokovic, Nadal, Roger Federer and Andy Murray to be crowned number one since Andy Roddick, way back on February 1, 2004 (18 years, three weeks and six days).

198 - At 198cm in height, Medvedev is the tallest player to be crowned world number one.

13 - Medvedev has won 13 Tour-level titles so far.

27 - He is the 27th different ATP world number one. The first was Ilie Nastase, in August 1973.

3 - Medvedev is the third Russian player to reach the top of the ATP rankings, after Yevgeny Kafelnikov (May 1999) and Marat Safin (November 2000).

6 - At 26, Medvedev is the sixth-oldest player to become world number one for the first time in their career.

361 - Djokovic has held the number one spot for 361 weeks in total – a record. It had been 86 weeks since the Serbian was last not at the top of the pile.

Former US Open winner Sloane Stephens claimed her first WTA title since 2018 after downing Marie Bouzkova in three sets in Sunday's Abierto Zapopan decider in Guadalajara.

American sixth seed Stephens triumphed 7-5 1-6 6-2 in an epic final which lasted two hours and 28 minutes against 96th-ranked Bouzkova.

Stephens, who won the 2017 US Open, has struggled to re-discover her previous levels of success in recent years, having gone undefeated in the first six WTA singles finals of her career and reaching the world number three ranking.

But Sunday's triumph – Stephens' seventh career WTA title - marks a major return to form for the 28-year-old who lost in the first round of last month's Australian Open to Emma Raducanu.

Stephens had trailed 4-1 in the first set but hit back before Bouzkova double faulted on break point at 5-5.

However, the Czech responded in a one-sided second set, breaking Stephens early and never looking back.

The American claimed the first break of the deciding set at 3-2, with Bouzkova letting slip a 40-0 lead, with Stephens' forehand leading her to victory.

Pedro Martinez secured his maiden ATP Tour title with a 4-6 6-4 6-4 victory over Sebastian Baez at the Chile Open on Sunday.

Both players were competing for their first success in Santiago, with fourth seed Martinez appearing in his second tour-level final after losing to Casper Ruud in Kitzbuhel in July.

World number 72 Martinez sat six places above his opponents in the rankings, but it was seventh seed Baez who claimed the first set before the Spaniard bounced back to send the match to a decider.

Martinez carried that second-set impetus into the final set, eventually triumphing after 2 hours and 48 minutes as he condemned Baez to just his third loss in 29 outings in Chile since the start of the 2021 season.

Elina Svitolina has penned an emotive letter to her homeland of Ukraine, pledging to donate her prize money to military and humanitarian needs after Russia's invasion.

Russia invaded neighbouring Ukraine on Thursday. That conflict has escalated over the weekend.

Russia and Vladimir Putin's government faces heavy political and financial sanctions, while sports organisations such as the International Olympic Committee (IOC) and UEFA have also condemned the attack.

St Petersburg has been stripped of this season's Champions League final, while Poland, Sweden and the Czech Republic have refused to play Russia in qualifiers for the upcoming FIFA World Cup. Formula One has pulled the Russian Grand Prix from its race calendar for 2022.

Several tennis players have spoken out against Russia's aggression, including Russian duo Andrey Rublev and Daniil Medvedev, who will ascend to world number one in the ATP rankings on Monday.

On Saturday, Svitolina – the former WTA world number three – told Sky Sports News she was "shocked at this terrible nightmare".

Svitolina has family and friends back in Ukraine and, on Sunday, she posted an emotional message on her social media channels.

"Letter to my Motherland, I am currently far away from you, out of sight from my loved ones, far from my people, but my heart has never felt so warm and filled of your soul," Svitolina's message read.

"It is difficult to express how special you are. To me you are strong, beautiful and unique. You gave me everything and I cherish every piece of you: your culture, your education, your lands, your seas, your cities, your people. My people.

"My people, every day I fear for you. I am devastated, my eyes won't stop crying, my heart won't stop bleeding. But I am so proud. See our people, our mothers, our fathers, our brothers, our sisters, our children, they are so brave and strong, fighting to defend you. They are heroes.

"I commit to redistribute the prize money of my next tournaments to support army and humanitarian needs and help them to defend you, our country.

"Ukraine, you unify us, you are our identity. You are our past and our future. We are Ukraine."

Svitolina also called on other nations to continue to step up their efforts to stop the invasion.

"May the world see it and help us to join forces to protect you," she wrote. "You are in all my thoughts and prayers. You are always with me. I am Ukraine. We are Ukraine."

Rafael Nadal said he will not measure himself against other players' records until his career is over after adding another trophy to his impressive collection, beating Cameron Norrie in straight sets to lift the Mexican Open.

Nadal continued his undefeated start to 2022 with his third title for the year after beating the British sixth seed 6-4 6-4 in Acapulco on Saturday.

He is now on a run of 15-0 this season, claiming his 91st ATP Tour crown along the way.

It was also Nadal's fourth Mexican Open title, having previously won in 2005, 2013 and 2020.

His recent win at the Australian Open put him clear of Novak Djokovic and Roger Federer on 21 grand slam titles, but he still sits behind Ivan Lendl (94), Federer (103) and Jimmy Connors (109) for ATP tournament victories.

After his win in Mexico, Nadal said he is not concerned about records as long as he is still playing, saying: "At the end of the day, I've always said that this kind of record needs to be measured once your career is over.

"Today the most important thing is that I have won a prestigious tournament."

The 35-year-old's incredible form is all the more impressive considering he was forced to miss last year's US Open to deal with a foot issue that troubled him all the way to the lead-up to January's Australian Open.

"It was complicated, and I ended up taking the victory. Looking back, a few weeks ago this would have looked impossible," he added.

"It's amazing how things can change in such a short span, from not being able to practice and now to be where I am today."