The former world number one Maria Sharapova loses first round match with a 6-4 6-4 defeat to Japan's Naomi Osaka at the Indian Wells tennis tournament.
Russia's Alexander Krushelnitsky, who competes in curling, one of the Games' least physically taxing sports, is suspected of testing positive for Meldonium – the same substance that saw Russian tennis star Maria Sharapova suspended.
Meldonium burst to the fore in 2016 when Maria Sharapova announced that she had failed a drugs test. Although she was banned for 15 months, more than 170 athletes have since tested positive for the substance, Olympians included.
Alexander Krushelnitsky still has to be officially named and undergo a second test, but if confirmed the incident could keep the Russia's banned team from being reinstated and marching under the national flag at the closing ceremony.
Federer continued his dominance over Richard Gasquet to reach the round of 16 at the Australian Open and keep his quest for a 20th Grand Slam title on track.
Defending champion Roger Federer will face Slovenian Aljaz Bedene in the first round, while world number one Rafael Nadal takes on Dominican Victor Estrella Burgos.
Romania's Simona Halep scores her first victory in eight attempts over Maria Sharapova in the third round of the China Open continuing in Beijing.
Maria Sharapova was beaten by Latvia's Anastasija Sevastova 5-7 6-4 6-2 in their last 16 match at Flushing Meadows.
Maria Sharapova defeated Hungary’s Timea Babos paving way for her to enter semifinals, where she could meet Spain's Garbine Muguruza.
Five-time grand slam winner and former world number one Maria Sharapova marked her first Grand Slam appearance since her doping ban ended with a 6-4, 4-6, 6-3 victory over Romanian second seed Simona Halep at the US Open.
The former world number one, who only returned from a 15-month doping ban last month, will sit out the French Open for the second year in a row.
Canadian tennis player Eugenie Bouchard, who earlier called Maria Sharapova "a cheater", reiterated her stance that the Russian star should not have been allowed to play after she was found guilty of using a performance enhancer.
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