The former world record holder, who will face Olympic and World champion Usain Bolt and American rival Tyson Gay later in the season on the 14-meet circuit, won in 9.81 seconds.
Powell's compatriot Nesta Carter was second in 9.88 with American Travis Padgett finishing third in 9.92 seconds. Powell had run 9.75 in his semifinal heat, which would have been a world leading time if it had not been wind-assisted.
Reuters
Results: Men: 100M: Asafa Powell (Jam) 1; Nesta Carter (Jam) 2; Travis Padgett (US) 3. T: 9.81S. 800M: David Lekuta Rudisha (Ken) 1; Asbel Kiprop (Ken) Amine Laalou (Mor) 3. T: 1:43.00.5000M: Eliud Kipchoge (Ken) 1; Vincent Kiprop Chepkok (Ken) 2; Imane Merga (Eth) 3. T: 12:51.21.
400M hurdles: Bershawn Jackson (US) 1; Kerron Clement (US) 2; LJ van Zyl (SA) 3. T: 48.66S. 3000M steeplechase: Ezekiel Kemboi (Ken) 1; Paul Kipsiele Koech (Ken) 2; Patrick Kipkirui Langat (Ken) 3. T: 8:06.28.
Triple jump: Alexis Copello (Cub) 1; Arnie David Girat (Cub) 2; Yoandri Betanzos (Cub) 3. D: 17.47M. Shot put: Christian Cantwell (US) 1; Ralf Bartels (Ger) 2; Reese Hoffa (US) 3. D: 21.82M.
Women: 200M: Kerron Stewart (Jam) 1; Sherone Simpson (Jam) 2; Cydonie Mothersill (Cayman) 3. T: 22.34S. 400M: Allyson Felix (US) 1; Amantle Montsho (Bot) 2; Novlene Williams-Mills (Jam) 3. T: 50.15S. 1500M: Nancy Jebet Langat (Ken) 1; Gelete Burka (Eth) 2; Siham Hilali (Mor) 3. T: 4:01.63.
100M hurdles: Lolo Jones (US) 1; Priscilla Lopes-Schliep (Can) 2; Virginia Powell-Crawford (US) 3. T: 12.63S.
High jump: Blanka Vlasic (Cro) 1; Chaunte Howard Lowe (US) 2; Ruth Beitia (Spa) 3. H: 1.98M.
Pole vault: Silke Spiegelburg (Ger) 1; Tatyana Polnova (Rus) 2; Jirina Ptacnikova (Cze) 3. H: 4.70M.
Discus: Yarelis Barrios (Cub) 1; Dani Samuels (Aus) 2; Sandra Perkovic (Cro) 3. D: 64.90M.
Javelin: Maria Abakumova (Rus) 1; Barbora Spotakova (Cze) 2; Martina Ratej (Slo) 3. D: 68.89M.
