Here's a look at Sunday's TV highlights at the Summer Olympics (times subject to change):
4 a.m. ET Rowing, Canada's women's lightweight double and women's eight compete in heats (CTV)
7 a.m. ET Cycling, women's road race featuring veteran Clara Hughes in her return to Olympic cycling (TSN)
9:45 a.m. ET Artistic gymnastics, U.S. women's stars Jordyn Wieber and Gabby Douglas make their debut against a re-invigorated Russian squad and the powerhouse team from China (Rogers Sportsnet)
10 a.m. ET Diving, Emilie Heymans and Jennifer Abel compete in 3-metre synchronized event (CTV)
2:30 p.m. ET Swimming finals, featuring American star Michael Phelps in mens 4x100-metre freestyle relay (CTV)
