*Note: Links to all of today's tennis streams are available below.
Catch the United States' former World No. 1 Venus Williams as she takes on Belgium's Kristen Flipkens. You can watch NBCOlympics.com's live stream here.
Venus is seeded fifth in singles at the 2016 Rio Olympic Games, and first (alongside sister Serena) in doubles.
On Centre Court, Kei Nishikori has taken the first set from Alberto Ramos-Vimolas without much of a fight.
On the outer courts, the United States' Madison Keys - who has performed well in 2016 - has been struggling against Montenegro's Danka Kovinic. Still, the American leads in the first set, 5-3.
First up on Centre Court: No. 4 seed Kei Nishikori of Japan takes on Spain’s unseeded Alberto Ramos-Vinolas.
Alberto Ramos-Vinolas vs. Kei Nishikori, 9:45 AM EST
Madison Keys vs. Danka Kovinic, 10:00 AM EST
Barbora Strycova vs. Yanina Wickmayer, 10:00 AM EST
Sara Errani vs. Kiki Bertens, 10:00 AM EST
Ricardas Berankis vs. John Millman, 10:00 AM EST
Ana Ivanovic vs. Carla Suarez Navarro, 12:00 PM EST
Grigor Dimitrov vs. Marin Cilic, 12:00 PM EST
Jack Sock vs. Taro Daniel, 12:00 PM EST
Heather Watson vs. Peng Shuai, 12:00 PM EST
Timea Bacsinszky vs. Zhang Shuai, 12:00 PM EST
Malek Jaziri vs. Jo-Wilfried Tsonga, 2:00 PM EST
Agnieszka Radwanska vs. Zheng Saisai, 2:00 PM EST
Andrea Petkovic vs. Elina Svitolina, 2:00 PM EST
Steve Johnson vs. Darian King, 2:00 PM EST
Brian Baker vs. Yuichi Sugita, 2:00 PM EST
Gilles Simon vs. Borna Coric, 4:00 PM EST
Philipp Kohlschhreiber vs. Guido Pella, 4:00 PM EST
Sloane Stephens vs. Eugenie Bouchard, 4:00 PM EST
Damir Dzumhur vs. Dudi Sela, 4:00 PM EST
Cilic/Draganja (CRO) vs. Djokovic/Zimonjic (SRB), 5:30 PM EST
Anna Schmiedlova vs. Roberta Vinci, 5:30 PM EST
Bacsinskzy/Hingis (SUI) vs. Gavrilova/Stosur (AUS), 5:30 PM EST
Venus Williams vs. Kristen Flipkens, 5:45 PM EST
Gael Monfils vs. Vasek Pospisil, 8:00 PM EST