The U.S. 4x100-meter medley relay team is a favorite for gold on Sunday (Saturday night East coast time). That would give
Lezak's outstanding relay split in the 4x100 freestyle notwithstanding, Sullivan is the faster swimmer. It was almost forgotten that he set a world record 47.24 seconds in the first leg of that race, the only split than can be considered for record purposes because it begins from a dead start. Sullivan is an animal over the first 50 meters, so if he is anywhere near Lezak when he jumps in the pool, he could make up a chunk of deficit quickly. If the U.S. lead is more than a bodylength at this point, Lezak should be able to preserve it.