Former world number one Maria Sharapova has revealed she failed a drugs test at the Australian Open.
The Russian, 28, tested positive for meldonium, a substance she has been taking since 2006 for health issues.
The International Tennis Federation (ITF) said the five-time Grand Slam champion would be provisionally suspended from 12 March.
Sportswear company Nike said it was halting its relationship with her until the investigation was complete.
"I did fail the test and take full responsibility for it," said Sharapova, who won Wimbledon as a 17-year-old in 2004.
Rory McIlroy says the injury lay-off that saw him miss his defence of The Open Championship title at St Andrews has left him with a "hunger" for success.
The Northern Irishman describes the quality of play in his absence by world number one Jordan Spieth and number two Jason Day as "motivating".
McIlroy believes he had "reached that level before" and that it is "just a matter of getting back there".
Sir Bradley Wiggins and Mark Cavendish teamed up to win the madison as Britain claimed a fifth gold medal at the Track World Championships in London.
The duo, who won gold the last time they competed in this race in 2008, were roared on to victory by a partisan crowd, beating France into second.
Laura Trott also pleased the Lee Valley VeloPark fans, winning the omnium to claim her second gold of the week.
GB topped the medal table with five golds, one silver and three bronze.