Images from the US Open men's singles second round matches, at Flushing Meadows, New York, on Thursday.
Match-fixing has become increasingly pervasive in recent years across a number of sports.
Summary of sports events and persons who made news on Thursday
Russian tennis star Maria Sharapova, the highest-paid woman in sports, said on Monday that she failed a drug test at the Australian Open due to a substance she has been taking for 10 years for health issues.
One of Maria Sharapova's biggest sponsors, Nike Inc., said it was suspending ties while the case is being investigated.
'The suspicion of doping will hang over numerous men and women players including the elite stars,' says Desh Gaurav Chopra Sekhri.
Tennis star Maria Sharapova said on Tuesday she is excited about her return to competition next month, feeling vindicated by the reduction of her doping suspension and empowered by her time away.
Novak Djokovic says he has lost all trust in the anti-doping programme in tennis and fears he could become a victim of its 'negligence' after fellow Serb Victor Troicki failed to have his doping ban overturned on Tuesday.
Summary of sports events and persons who made news on Wednesday
Summary of sports events and persons who made news on Tuesday