Several U.S. Olympic champions highlight the Penn Relays and Drake Relays fields, live on NBCSN and NBC Sports Live Extraon Saturday.
At the Penn Relays in Philadelphia, the U.S. 4x100m, 4x200m and 4x400m pools include:
Justin Gatlin — 2004 Olympic 100m champion
Tyson Gay — 2012 Olympics 100m, fourth place
Carmelita Jeter — 2012 Olympic 100m silver medalist
Jeremy Wariner — 2004 Olympic 400m champion
Sanya Richards-Ross — 2012 Olympic 400m champion
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.