Phelps-Lochte expected showdown airs on NBC in primetime on day 1 of London Olympics

Team USA competes in men's beach volleyball and women's basketball on NBC

Day 1 of the 2012 London Olympic Games begins Saturday with an expected head-to-head showdown between Michael Phelps and Ryan Lochte in primetime on NBC, as they contend for the gold in the men's 400 meter individual medley. Phelps' and Lochte's qualifying heats will air on NBC live beginning at 5 a.m.

NBC's daytime will air coverage of women's basketball, featuring Team USA facing Croatia at 11 a.m., and men's beach volleyball, featuring Beijing's gold medal duo Jake Gibb and Sean Rosenthal of Team USA matching up against Freedom Chiya and Grant Goldschmidt of South Africa from legendary Horse Guards Parade, in the heart of ceremonial London just down the road from the Queen's home at Buckingham Palace.

NBC Sports Network airs live coverage of women's soccer as Team USA faces Colombia at 11:30 a.m. from Hampden Park in Glasgow, Scotland. Live on MSNBC, Olympic host nation Great Britain takes on Camaroon at Millennium Stadium in Cardiff, Wales, at 12:15 p.m.

All of the events mentioned above and all other events will be live streamed on NBCOlympics.com and the NBC Olympics Live Extra app, available on mobile devices and tablets. The vast majority of live stream content will only be available to authenticated cable, satellite or telco customers.

For more information on live streaming, visit NBCOlympics.com/LiveExtra.

For the full schedule of NBCUniversal's Olympic coverage, visitNBCOlympics.com.