Jeneba Tarmoh

Sudanese-born Lopez Lomong edged defending champion Matthew Centrowitz in a meet-record time, edging his 2012 US Olympic teammate to win the feature mile showdown at the 106th Millrose Games.

American world champion Carmelita Jeter fired a warning to Jamaica's sprint queens on Friday, qualifying quickest for the semi-finals of the Olympic women's 100m in a blistering time of 10.83sec.

Allyson Felix hopes the "breakthrough" 200m run she produced at the US trials will be the springboard for Olympic gold over the distance at the third time of trying.

The United States experienced highs and lows in Friday's Diamond League event in Monaco, with an injury scare for LaShawn Merritt but world-leading times for hurdler Aries Merritt and the men's 4x100m relay team.

The United States' leading women's 4x100m relay team were unable to finish their race at the Diamond League meet in Monaco on Friday after a mix-up during the final baton hand-over.

Allyson Felix ran the sixth-fastest women's 200 meters ever clocked, the fastest in the world for 14 years, and promptly put the impressive achievement into sobering perspective.

Allyson Felix will run in the 100 and 200 meters at the London Olympics after Jeneba Tarmoh backed out of a planned Monday run-off for the last 100m berth, USA Track and Field announced.

Sanya Richards-Ross moved closer to a London Olympics 200-400 double while injured sprinter Walter Dix lost a chance for a sprint medal repeat at the US Olympic Track and Field Trials.

Allyson Felix and Jeneba Tarmoh were deadlocked again on Friday at the US Track and Field Championships, advancing to the 200-meter women's final in the same time, 22.30 seconds.

Galen Rupp won his second title of the US Olympic Track and Field Trials, adding the 5,000 meters crown to his 10,000 triumph and shattering the meet record of legend Steve Prefontaine.