Paula Badosa spoiled Simona Halep's return from a doping ban.
While some say the five-times Grand Slam champion, initially banned for two years after testing positive for Meldonium, has done her time some fellow players are angry the red carpet is being rolled out.
The ITF said its independent Anti-Doping Tribunal ruled that 27-year-old Argentine tested positive for the banned stimulant etilefrine after his French Open final defeat by Spain's Rafael Nadal in June.
Russian former world number one Maria Sharapova was suspended for two years by the International Tennis Federation on Wednesday following her positive test for banned drug meldonium at this year's Australian Open.
Disgraced former Tour de France winner Jan Ullrich admitted that he underwent blood-doping procedures under the guidance of a Spanish doctor at the heart of a major drugs scandal.
World No 15 Marin Cilic is under the radar of the International Tennis Federation for failing a drug test during the BMW Open in Munich in April, it has been reported.
The Bulgarian teenager has been banned for two years for doping, the International Tennis Federation said.
Newly-elected president of the French Tennis Federation (FFT), Bernard Giudicelli, has indicated that they are reluctant to hand Maria Sharapova a wild card entry for this year's Grand Slam tournament despite the embattled Russian tennis star returning from a doping ban.
Spanish tennis maestro Rafael Nadal has defended his training methods and outrightly rejected to have used any banned substance in order to speed up his recovery from injury.
The world No. 4 said he is convinced the sports does not have a problem with doping.
A Belgian court on Monday suspended a one-year ban imposed on tennis players Yanina Wickmayer and Xavier Malisse for violating anti-doping regulations, Wickmayer's agent said.
Here is the current state of play among the 28 Olympic sports.
Winter Games' least taxing and physically demanding sports feel it necessary to use performance-enhancing drugs
Maria Sharapova's comeback from a doping ban will include an appearance at the Rogers Cup in August after the former world number one was granted a wild card by the organisers of the Toronto tournament on Tuesday.
The Canadian set the tournament alight with a scintillating, three-set win over Maria Sharapova on Tuesday after her outspoken comments about the Russian returning from her 15-month doping ban, including calling her a cheater.
The former Czech No. 1, who tested positive for nandrolone, was also fined $43,770 and had 100 ranking points deducted.
UK Anti-Doping (UKAD) said it was "deeply concerned and shocked" by a Sunday Times report in which a British doctor alleged he had prescribed banned performance-enhancing drugs to 150 sportsmen including several Premier League footballers.
A lengthy ban for doping would be devastating for five-times grand slam champion Maria Sharapova but she would survive it, Nick Bollettieri, the man who discovered her, said on Tuesday.
Damaging wind gusts, a fresh doping controversy and the robbery of a visiting government minister presented the Rio Games with a perfect storm of problems on Sunday, forcing organisers to scramble to keep the world's biggest sporting event rolling on.
The World Anti-Doping Agency (WADA) on Wednesday defended the Therapeutic Use Exemption (TUE) system after some athletes' confidential medical data was leaked by a group of Russian hackers, shedding light on potential abuse.
US Open semi-finalist Yanina Wickmayer must wait to see whether she can return to action even though a Belgian court has suspended a one-year ban imposed on her for violating anti-doping regulations.
Russia was the leading doping offender in global sport during 2014, followed by Italy and India, the World Anti-Doping Agency said on Wednesday.
Banned Serbian tennis player Viktor Troicki was "innocent" of a doping violation and the country's Davis Cup team supported him, World No 1 Novak Djokovic said on Tuesday.
Any female tennis player found guilty of match-fixing will be given a lifetime ban from the sport, the head of women's tennis Larry Scott said.
Nike launched a new running shoe that complies with limits set by World Athletics after the governing body imposed a landmark ban on a version of the sportswear giant's Vaporfly shoes that was used to run the first sub-two hour marathon. The first-ever shoe ban by World Athletics (WA) last week addressed concerns that technology advances are giving athletes an unfair and unnatural advantage, described by some critics as "technological doping".
Maria Sharapova has shrugged off Caroline Wozniacki's criticism of US Open organisers for giving the Russian centre court billing in her return to Grand Slam tennis after a doping ban.
Sharapova was granted a wildcard entry to the last Grand Slam of the season but received a tough first-round draw in the shape of Romanian Halep.
'No words, games, or actions will ever stop me from reaching my own dreams. And I have many'
Rafael Nadal is convinced that none of his rivals are taking performance-enhancing drugs and believes that people who have accused him of doping have 'personal problems'.
Russian tennis player Svetlana Kuznetsova blamed politics for the decision to ban her country's track and field athletes from the Rio Olympics and said it was unfair to group them all together as doping cheats.
Maria Sharapova's reduced suspension for a doping violation is set to provide a healthy boost to her bank balance with corporate sponsors reaffirming their commitment to the Russian player. The 29-year-old can return to the court next April after the Court of Arbitration for Sport reduced her two-year ban by nine months on Tuesday. Sharapova's stunning admission in March that she had tested positive for meldonium at the Australian Open, and her subsequent ban by the International Tennis Federation, saw a number of sponsors distance themselves from her.
So prior to their Melbourne Park rematch, former champion Sharapova said she was primed and ready for another drawn out dog-fight against the 14th seed.
Images from the US Open men's singles second round matches, at Flushing Meadows, New York, on Thursday.
Claiming to have accessed WADA's database, Fancy Bears' hack team claimed to have leaked dozens of files allegedly relating to United States athletes on the internet.
Maria Sharapova withdrew from the Rogers Cup with a sore left arm on Thursday, putting the five-time grand slam champion's US Open participation in doubt.
Former world number one Maria Sharapova has been handed a wildcard to the Wimbledon warm-up tournament in Birmingham in June.
Former American great Chris Evert has no issue with tournaments handing Maria Sharapova wildcard entries as the Russian former world number one makes her way back from a doping ban, she said on Wednesday.
Summary of sports events and persons who made news on Tuesday
Not just because Serena Williams looks capable of landing a 24th Grand Slam title against all the odds having returned from maternity leave and Maria Sharapova is seeking redemption after a 15-month doping ban with a third French Open title.
Dhruv Munjal insists that women's tennis needs a golden generation, one that can make matches competitive and viewing more riveting.
