French Open champion Stanislas Wawrinka will join Andy Murray and Rafael Nadal at this year's pre-Wimbledon warm-up event at Queen's Club, Aegon Championships organisers said.
Novak Djokovic said a majority of players believe favouritism is at play in the tennis anti-doping system.
Wawrinka, who was making his first appearance since February after recovering from a persistent knee injury, committed 30 unforced errors as he struggled to rediscover his rhythm on his return to clay.
In the women's draw, Angelique Kerber was knocked out in a 6-3, 6-1 defeat to Czech Katerina Siniakova while Coco Gauf won her first ever match on clay.
Japan's Kei Nishikori dispatched error-strewn Swiss Stan Wawrinka 6-2, 6-3 in a disappointingly one-sided clash at the ATP World Tour Finals on Monday.
World number three Stanislas Wawrinka stormed back from a set down to beat German qualifier Mischa Zverev 4-6, 6-3, 6-3 and retain the men's title in Geneva on Saturday.
Drained Medvedev pulls out of home tournament in Moscow
Three-times Grand Slam champion Stan Wawrinka returned to the big stage in style on Monday, ousting sixth seed Grigor Dimitrov 1-6, 7-6(3), 7-6(5), 6-4 on Centre Court at Wimbledon.
Swiss third seed Stanislas Wawrinka outlasted tiring former champion Juan Martin del Potro in four sets to advance to the semi-finals of the US Open on Wednesday.
World number three Stanislas Wawrinka fell at the first hurdle in the Dubai Open on Tuesday, beaten 7-6(4), 6-3 by 77th-ranked Bosnian Damir Dzumhur.
'I feel very disappointed at the end. Long time since I cried after a match, so emotionally wasn't easy to handle. I will try to learn from it as much as I can'
Rafael Nadal wins his 10th French Open title beating Stanislas Wawrinka 6-2, 6-3, 6-1 on Sunday.
Wawrinka, winner of three Grand Slam tournaments, trailed by two sets overnight, having squandered set points in the opener, but led 6-5 in the third when play resumed in muggy conditions.
Wawrinka, making his first return to the site of his 2016 triumph since undergoing knee surgery, showed he was still shaking off the ring rust despite encouraging victories in the first two rounds.
Stanislas Wawrinka edged out Cypriot Marcos Baghdatis in a nerve-jangling, near-30 minute tiebreak to secure the Dubai Duty Free Championship with a 6-4, 7-6(13) triumph on Saturday.
As his blazing backhand skidded off from inside the baseline, Stanislas Wawrinka sent his racket rocketing skywards after dashing Novak Djokovic's French Open dreams with a victory barely anyone expected on Sunday.
India's Sumit Nagal gave a mighty scare to three-time Grand Slam winner Stan Wawrinka by taking off the first set but then wilted under pressure to bow out of the Prague Open in the quarter-finals on Thursday.
Factbox on Italy's Jannik Sinner, who beat Germany's Alexander Zverev 6-3, 7-6(4), 6-3 in the Australian Open final
Defending champion Stanislas Wawrinka survived some anxious against Gilles Muller before proceeding into the men's singles semi-finals at the ATP Chennai Open tennis tournament.
Stanislas Wawrinka returned to form with a 6-1, 6-1 thrashing of Tomas Berdych at the ATP World Tour Finals on Monday.
The unpredictable nature of the 2024 US Open has turned it into one of the most thrilling Grand Slam tournaments in recent memory.
French Open champion Stan Wawrinka warmed up for the defence of his title at Roland Garros with a 6-4, 7-6(11) victory over Marin Cilic to win the Geneva Open title on Saturday.
Stanislas Wawrinka was still struggling to digest the fact that he had won a second grand slam title, and did it by overcoming a player who had until Sunday, been unbeatable on clay in 2015.
It has now come to light that Federer's wife Mirka is at the centre of this now infamous row between the seventeen-time Grand Slam champion and the 2014 Australian Open champion.
Men's champion Stan Wawrinka avenged a tough defeat to Kei Nishikori at last year's US Open at the Australian Open on Wednesday.
Stanislas Wawrinka claimed his first indoor silverware when he beat defending champion Tomas Berdych.
Stanislas Wawrinka and his wondrous one-handed backhand managed to pull off a feat no man outside tennis's Big Four had achieved in the past 40 Grand Slams -- to win two major titles
World number four Stan Wawrinka has withdrawn from this month's Rogers Cup in Montreal and the Western & Southern Open in Cincinnati due to a knee injury, the Swiss said on Wednesday.
The 33-year-old Swiss, ranked 261 in the world after two knee surgeries, served solidly throughout a one-sided contest on the slick centre court, easing past an opponent who struggled to cope with Wawrinka's power.
Claycourt king Rafael Nadal marched into his 10th French Open final after demolishing rising Austrian Dominic Thiem 6-3, 6-4, 6-0, while third seed Stan Wawrinka edged past Andy Murray 6-7, 6-3, 5-7, 7-6, 6-1.
There were no jeers this time as Swiss Stan Wawrinka defied the odds to win the French Open with a courageous 4-6, 6-4, 6-3, 6-4 victory over world number one Novak Djokovic in an enthralling final on Sunday.
World number five Stanislas Wawrinka has added former Wimbledon champion Richard Krajicek to his coaching team for the grasscourt season, the Swiss player said on Friday.
Murray, who took a wildcard into the seaside event as a fitness test for next week's Wimbledon, looked sharp on a sun-baked centre court and tasted victory for the first time since beating Benoit Paire in the last 16 of Wimbledon 350 days ago.
Stan Wawrinka reached his second final of the season as Nick Kyrgios retired injured from their semi-final at the ATP Dubai Championships on Friday. The Australian quit due to back pain while trailing 6-4, 3-0, having had on-court treatment after the seventh game of the opening set. Wawrinka now moves into position for a possible second trophy of the season after winning in Chennai to start the year. The French Open champion will face either sixth seed Feliciano Lopez, who advanced in the quarter-finals when Novak Djokovic was unable to continue due to an eye infections or former Australian Open finalist Marcos Baghdatis. Wawrinka, ranked fourth, carries an enviable record into the Saturday title match at the Aviation Club, having won his last eight finals.
Four more performances like that at the O2 Arena this week should guarantee Andy Murray will end 2016 leading the pack.
Third seed and Australian Open champion Wawrinka recovered from the loss of the opening set to claim his maiden Masters title on the Monte Carlo clay just six weeks before the start of the May 25-June 8 grand slam tournament in Paris.
Former champion Stan Wawrinka engaged in a war of words with Jo-Wilfried Tsonga before winning the only argument that mattered on Tuesday, storming into the Australian Open semi-finals with a 7-6(2), 6-4, 6-3 win over the Frenchman.
The French Open champion is pictured playing his famously brutal on-handed backhand return, STARK NAKED!
Stan Wawrinka outslugged Japanese sixth seed Kei Nishikori 4-6, 7-5, 6-4, 6-2 in energy-sapping humidity at Flushing Meadows on Friday to set up a US Open final against world number one Novak Djokovic.
The 32-year-old Swiss will try and stop Rafael Nadal becoming the first player in the professional era to win the same Grand Slam 10 times.
