Michael Phelps wrapped up his unprecedented Olympic career Saturday in London with an 18th gold medal, helping the U.S. men capture the 4×100-meter medley relay. That dominating performance followed a world-record breaking victory by the U.S. women, with Missy FranklinRebecca Soni, Dana Vollmer and Allison Schmitt finishing the 4×100 medley relay in 3:52.05.

Click the above image to see a gallery of highlights from Day 8.

Pretty good day in all for Team USA, which also collected golds in tennis (Crip-walking Serena Williams and the Bryan brothers) and shooting (Jamie Lynn Gray). Entering today’s events, the U.S. leads China by one in gold medals (26-25) and overall (54-53).

There are 23 gold medals up for grabs in 11 sports today. Check out our viewer’s guide below to figure out what to watch and when.

Going for the gold

Here is the list of sports that will hand out medals Sunday, along with their respective times and channels on NBC’s coverage platforms (and for a full look at today’s TV schedule, check our listings here):

Track and field (all streaming):

  • Women’s marathon (6 a.m., NBC): In only her second marathon ever, middle-distance specialist Shalane Flanagan set a U.S. Olympic marathon trials record of 2:25:38.
  • Women’s triple jump (2:35 p.m.)
  • Men’s hammer throw (3:20 p.m.): First-time Olympian Kibwe Johnson will compete.
  • Women’s 400m (4:10 p.m.): Americans Sanya Richards-RossFrancena McCorory and Dee Dee Trotter will account for three of the eight participants.
  • Men’s steeplechase (4:25 p.m.): Princeton grad Donn Cabral and U.S. trials winner Evan Jager compete.
  • Men’s 100m (4:50 p.m.): All eyes will inevitably be on Jamaican superstar Usain Bolt, but the Americans are also contenders. In first-round heats, Ryan Bailey (9.88 seconds) and Justin Gatlin (9.97) both broke the 10-second barrier. American Tyson Gay, the former world champion, won his heat in 10.08 seconds.

Shooting – men’s 50m pistol (7:25 a.m., streaming)

Badminton – men’s singles and doubles (8 a.m., streaming)

Sailing – men’s star, finn (8 a.m., streaming)

Gymnastics – men’s floor (9 a.m.), women’s vault (9:50 a.m.), Men’s pommel horse (10:41 a.m., all streaming): Fab Five” member McKayla Maroney will compete in vault despite an injured toe.

Tennis (all streaming):

  • Women’s doubles (7 a.m., NBC Sports): The Williams sisters face the Czech tandem of Andrea Hlavackova and Lucie Hradecka.
  • Men’s singles (9 a.m., NBC): Roger Federer seeks a Golden Slam as he faces home-court favorite Andy Murray in a Wimbledon rematch.
  • Mixed doubles (11 a.m., NBC Sports): Victoria Azarenka and Max Mirnyi of Belarus will play Britain’s Murray and Laura Robson.

Weightlifting – women’s +75kg (10:30 a.m., streaming): Americans Sarah Robles and Holly Mangold compete.

Cycling – men’s omnium 1km time trial (1:16 p.m., streaming)

Diving – women’s 3m springboard (2 p.m., streaming): Americans Cassidy Krug and Christina Loukas placed fifth and sixth, respectively, in the semifinals.

Wresting – Men’s Greco-Roman 55kg and 74kg (2:03 p.m., streaming)

Fencing – men’s team foil matches (2:15 p.m., streaming)

Best of the rest

Track and field: Matt Centrowitz of Annapolis races in the 1,500-meter semifinal, streaming at 3:25 p.m. (And if you haven’t yet, be sure to check out Amy Shipley’s story featuring Centrowitz on the strategy that goes into being a world-class runner.)

Women’s beach volleyball: Misty-May Treanor and Kerri Walsh continue their quest for a third straight gold medal as they face Italy in the quarterfinals. (2 p.m., NBC Sports)

Women’s basketball: The American women look to extend their winning streak to 37 games when they play China at 11:45 a.m. (NBC)

Tweet of the day