McQuay was a member of the U.S. 4 × 400 metres relay team that qualified for the finals with the second fastest time (2:58,38), coming behind Jamaica. In the final, the United States became Olympic champions in a time of 2:57,30, with Jamaica second and Bahamas third. McQuay earned his second Olympic medal. McQuay's 400m race split was 43.5 as reported by announcer Ato Bolden.