Canada's Chantel Petitclerc edged out her rivals to win the women's 800m wheelchair race in Athens.
Petitclerc is an experienced Paralympic campaigner
Great Britain's Tanni Grey-Thompson had been in a good position at the bell but faded around the final lap to eventually finish eighth.
Petitclerc held off the challenge of Australians Eliza Stankovich and Louise Sauvage for victory.
Germany's Robert Figl won the men's 1500 event with a strong display on the home straight.
Petitclerc was in a good position throughout the race as Edith Hunkeler tested her early on.
But she pushed hard from the bell to deny Sauvage a third Olympic gold in a new Olympic record of one minute 53.66 seconds.
In the men's race, Australia's Kurt Fernley looked good for most of the race but Figl challenged for victory late on.
This year's London Marathon marathon winner Saul Mendoza from Mexico was second with Thailand's Rawat Tana just edging out America's Scot Hollonbeck for third.