The 25-year-old Simpson, on the comeback trail from injury, won with authority over American Gloria Asumnu, while fellow Jamaicans Ainsley Waugh and Nickeisha Wilson and Guyana’s Aliann Pompey also won.

Simpson, an Olympic sprint relay gold medallist in 2004 and reigning Commonwealth Games 200-metre champion, dominated Asumnu (11.32) and Britain’s Emma Ania (11.43) for her sprint victory.

Waugh completed the 100-metre double for Jamaica and the MVP Track Club by landing the men’s 100 in 10.18 seconds, edging Italian Simone Collio (10.19) and American Ryan Bailey (10.20).

Barbadian Andrew Hinds, who had won his qualifying heat in 10.29, finished fifth in the final in 10.22. Jamaican Winston Barnes was sixth in 10.23 and Antiguan Brendan Christian was eighth in 10.35.

Pompey maintained her steady form by capturing the women’s 400 metres. Fresh from a national record 50.71 seconds in the semi-finals of the IAAF World Championships in Berlin two weeks ago, Pompey clocked 51.40 seconds to defeat Senegal’s 2001 world champion Ami Mbacke Thiam (51.50) and Russian Natalya Nazarova (52.10).

Jamaican Rosemarie Whyte (53.25) was fifth and her teammate Anastacia Leroy (53.49) sixth.

Wilson clocked 12.93 seconds to win the women’s 100-metre hurdles narrowly ahead of Russian Yuliya Kondakova (12.96).

In the women’s long jump, Jamaican Jovanee Jarrett posted 6.47 metres for the runner-up spot to American winner Funmi Jimoh (6.60m) and Markino Buckley also picked up a second place finish for Jamaica, clocking 50.18 behind American Bershawn Jackson (49.25) in the men’s 400-metre hurdles.