Caroline Wozniacki has said that athletes should make sure they "double, triple and quadruple check" their medications following revelations tennis star Maria Sharapova has failed a drugs test.
Speaking at a press conference in New York the Danish tennis star said athletes should be careful to check their medications for banned substances "because sometimes even things like cough drops and nasal sprays can be on the list".
Tennis star Caroline Wozniacki broke three and a half hours as she completed her first ever marathon in New York.
The 24-year-old Dane, who was running for the charity Team For Kids a week after her tennis season drew to a close, came home in three hours, 26 minutes and 33 seconds.
The former world number one was greeted at the finishing line by friend Serena Williams, who beat her in the WTA Championships semi-finals in Singapore last week.
Golf star Rory McIlroy has broken off his engagement with tennis player Caroline Wozniacki, he announced today.
The Northern Irish golfer and former world number one said the relationship ended after he realised he was not ready for marriage.
"There is no right way to end a relationship that has been so important to two people," McIlroy said.
He added: "The problem is mine. The wedding invitations issued at the weekend made me realise that I wasn't ready for all that marriage entails.
"I wish Caroline all the happiness she deserves and thank her for the great times we've had. I will not be saying anything more about our relationship in any setting."
Sports stars Rory McIlroy and Caroline Wozniacki have announced their engagement on Twitter.
Northern Irish golfer and current world Number Six McIlroy told his more than 1.8 million followers:
Danish tennis player Wozniacki added:
Wimbledon officials insisted their courts had been prepared the same way as in previous years as the grass continued to claim victims.
Seven players had already withdrawn on day three of the tournament when Maria Sharapova slipped during her clash with Michelle Larcher De Brito and went on to lose.
The Russian fell in a similar area to where Caroline Wozniacki had earlier fallen foul, and as she underwent eight minutes of treatment, a spectator was heard to shout "Sort the court out".
That added to a growing train of thought that the grass of Wimbledon may be a factor in the unusual rush of injuries.
Tournament officials denied that, though, with an All England Club spokesman saying: "There has been no change to the way we prepare the courts."
Former British number one Tim Henman also defended the state of the surface, telling the BBC: "The courts are in the same shape they always have been. It's bizarre how all these injuries are happening this year.
"I'm as interested as everyone else as to why there have been so many injuries as the courts are in fantastic shape."
Victoria Azarenka, the women's second seed, pulled out this morning after hurting her knee in a first-day slip, while Jo-Wilfried Tsonga, the men's sixth seed, called time after three sets of his meeting with Ernests Gulbis because of knee problems.
Steve Darcis (shoulder) had earlier made himself unavailable, while Maran Cilic (knee), John Isner (knee), Radek Stepanek (thigh) and Yaroslava Shvedova (arm) also either quit matches or could not start.