The Americans last won gold in the men's 200m in the 2004 Olympics, when Shawn Crawford led home a US clean sweep, and they look capable of repeating that.
Jamaica won the showcase 4x200 metres relay without Usain Bolt as their American rivals dropped the baton at the IAAF World Relays in Nassau, Bahamas on Sunday.
Images from the World Athletics Championships in Eugene, Oregon, on Monday, Day 4.
South African flag-bearer Caster Semenya powered to the 1,500 metres title at the Commonwealth Games on Tuesday, keeping her bid for a golden double at the Gold Coast intact.