US
The defending US Open champion beat 87th-ranked Czech Marie Bouzkova 6-4, 6-1, in 93 minutes to reach the second-round
US teen tested positive just before her trip for the Games as she came away with a 6-1, 6-4 victory over Sevastova
Tennis prodigy beats defending champion 6-3, 6-4 to enter last 16
15-year-old loses to Germany's Siegemund as latter bounces back to win 5-7, 6-2, 6-3
Teenager, also known as Coco, has played a fearless brand of tennis at Wimbledon
Top seed and world number one is seeking a fifth Wimbledon and 16th major as the Serb faces Philipp Kohlschreiber
15-year-old will face 39-year-old Venus Williams in a Wimbledon generational clash
American is first 15-year-old to compete in the main draw since Britain's Laura Robson in 2009