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Check out NBCOlympics.com's full preview for day six of tennis at the 2016 Rio Olympic Games:
According to the Rio 2016 tennis page, at least two matches have been added to tonight's schedule. Check here for updates.
Germany's Angelique Kerber is up a set in her quarterfinal match against Great Britain's Johanna Konta.
No. 2 seed Andy Murray is in a tough spot. The Briton is down 3-0 in the third set.
Meanwhile, Venus Williams has won her first round mixed doubles match alongside Rajeev Ram. Having previously played in Rio's singles and women's doubles competitons, this is her first win at this year's Olympics.
Murray trounces Fognini in the first set, 6-1.
Andy Murray up next on Centre Court. He'll play Italy's Fabio Fognini.
Spain's Rafael Nadal is halfway to a second singles gold after defeating France's Gilles Simon in straights.
Argentina's Juan Martin del Potro navigates himself out of trouble to win against Japan's Daniel Taro in three sets, 6(4)-7(7), 6-1, 6-2.
Argentina's Juan Martin del Potro into a third set against Japan's Daniel Taro.
An aritcle on today's blazing Madison Keys/Steve Johnson singles wins:
Spain's Rafael Nadal, on Centre Court, took the first set against France's Gilles Simon in a tiebreak.
Keys took just an hour to finish her match. She won 6-3, 6-1 against Russian opponent Daria Kasatkina.
Onto the semifinals.
Steve Johnson is ahead 3-1 in the second set of his singles match against Russian opponent Evgeny Donskoy, having won the first set 6-1.
On court 1, the United States' Madison Keys ripped a 5-0 lead in the first set before giving up a number of games. She ultimately won the set 6-0.