What to watch: the nighttime is the right time

7:00 p.m. ET, NBC, Swimming and Gymnastics: Lots of medal-winning action from the water cube, including the men's 4x100 free relay led by Michael Phelps, and Katie Hoff in the 400m free, and Brendan Hansen in the men's 100m breast. Also, women's gymnastics begins qualifications.

4:00 a.m. ET Sunday, MSNBC, Men's Badminton: Americans begin play in a sport that doesn't get enough love in the U.S., outside of Kansas City.