Rollins sees off Pearson for hurdles gold

American Rollins, who celebrates her 22nd birthday on Sunday, was last out of the blocks but had drawn level with defending champion Pearson by the ninth barrier and edged ahead of the Australian over the last to win in 12.44 seconds.

Olympic champion Pearson, who was plagued by a hamstring injury earlier in the season, finished second in 12.50.

Britain's Tiffany Porter got a great start but slipped back to finish third in 12.55.