The U.S. men's volleyball team begins defense of its 2008 gold medal against Serbia. (11:45 a.m. ET, NBC/Ch. 5)
The U.S. men's water polo team, which won a silver medal in Beijing, takes on Montenegro. (2:40 p.m., NBC/Ch. 5)
The U.S. women's field hockey team takes on Germany. (2:15 p.m., NBCSN)
Boxing action features Americans Errol Spence Jr. and Jose Ramirez.. (6:30-9:30 a.m.; 1:30-4:30 p.m., CNBC)
NBC PRIMETIME (6-11 p.m., Ch. 5): Michael Phelps has a chance to tie the Olympic record with his 18th medal in the 4x100 freestyle relay. And U.S. women gymnasts make their London debut in the qualifying round, hoping to make it to the medal competition.
Men's soccer: MSNBC has coverage of Brazil vs Belarus (8 a.m.); Sengal vs Uraguay (10 a.m.); and Great Britain vs. United Arab Emirates (12:45 p.m.)
Men's basketball (9:30 a.m., NBCSN): Spain, seen as a possible threat to Team USA's gold-medal hopes, takes on China.
Badminton (11:50 a.m., NBCSN): Americans Tony Gunawan and Howard Bach match up against a team from Malaysia.
Archery (1:45 p.m., NBCSN): Not surprisingly, the South Koreans are favored. They've won gold medals in all six games since the sport was added to the Olympics.