Several U.S. Olympic champions highlight the Penn Relays and Drake Relays fields, live on NBCSN and NBC Sports Live Extra on Saturday.
At the Penn Relays in Philadelphia, the U.S. 4x100m, 4x200m and 4x400m pools include:
Justin Gatlin: 2004 Olympic 100m champ
Tyson Gay: Olympic 100m, fourth place
Carmelita Jeter: Olympic 100m silver medalist
Jeremy Wariner: 2004 Olympic 400m champ
Sanya Richards-Ross: Olympic 400m champ
Also competing will be two-time Olympic 100m champion Shelly-Ann Fraser-Pryce, 2008 Olympic 100m silver medalist Kerron Stewart and 2015 World 200m silver medalist Elaine Thompson for Team Jamaica.
STREAM: Penn Relays: 12:30-3 p.m. ET
Next is the Drake Relays in Des Moines, Iowa, including:
- 2008 Olympic champion LaShawn Merritt versus 2012 Olympic champion Kirani James in the 400m
- World Indoor champion Vashti Cunningham in the high jump. Cunningham, 18, is the daughter of retired NFL Pro Bowl quarterback Randall Cunningham.
- 2008 Olympic champion Dawn Harper-Nelson versus 2013 World champion Brianna Rollins in the 100m hurdles.
STREAM: Drake Relays: 3-5 p.m. ET
MORE: Full NBC Olympic trials broadcast schedule