Jamaica's Usain Bolt (center) crosses the finish line ahead of US' Trayvon Bromell (right) and Japan's Aska Cambridge in the Men's 4x100m Relay Final during the athletics event at the Rio 2016 Olympic Games at the Olympic Stadium in Rio de Janeiro on Aug 19, 2016. (PEDRO UGARTE / AFP)

American Trayvon Bromell underlined his credentials as the Tokyo Olympics 100 meters gold medal favorite on Saturday by running the fastest time this year of 9.77 seconds at the New Life Invitational in Miramar, Florida.

American Trayvon Bromell becomes the ninth man to dip under 9.80 seconds, slashing nearly one-10th of a second off his personal best of 9.84

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Bromell becomes the ninth man to dip under 9.80 seconds, slashing nearly one-10th of a second off his personal best of 9.84.

Marvin Bracey of the United States was second in 9.85 followed by Chris Royster in 10.08.

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Reigning Olympic double sprint champion Elaine Thompson-Herah won the 100m and 200m events, clocking 10.87 and 22.54 seconds, respectively.