Wariner dominates in 400m

OSAKA, Japan (Reuters) - American Jeremy Wariner retained his world 400 meters title in dazzling style to lead an American sweep of the medals on Friday.

The 23-year-old Texan powered off the final bend to clock 43.45 seconds despite a swirling wind in Osaka.

LaShawn Merritt took silver in 43.96 with Angelo Taylor completing an all-American podium with a time of 44.32.

Olympic champion Wariner, who has not lost a championship race since 2004, exploded from the blocks and was quickly out in front before underlining his class in the last 100 meters.