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Lucia Stafford, competing at her second Olympics, opened competition for Canada on Tuesday with a season best of four minutes 2.22 seconds in Round 1 of the women's 1,500 metres.

The Toronto native will need to go through the repechage round Wednesday at 6:45 a.m. ET for a chance to qualify for Thursday's semifinal at Stade de France.

"I gave it my best and I can't be disappointed. I really wish it was a PB [personal best of 4:02.03 or faster] at least," the University of Toronto alumna told Devin Heroux of CBC Sports.

In June, she won a third straight Canadian title at Olympic trials in Montreal by two seconds ahead of Kate Current of London Western Track & Field Club who ran 4:09.81 Tuesday and is also headed to the repechage.

The 25-year-old Stafford said she'll run that race like any other.

"I'm going to … put myself in [the mix to advance to semis] and fight to win," said the Toronto native. "You can guarantee I'm going to run a 4:02 now. I'd love a frickin' 3:58."

On July 12, Stafford set the women's Canadian record in the 2,000 at 5:31.18. Angela Chalmers held the previous best of 5:34.49 since Sept. 4, 1994.

Montreal's Simone Plourde was the other Canadian in Tuesday's 1,500. She went 4:06.59 and will join Stafford and Current in the repechage.

Other events Tuesday include men's javelin, women's long jump, and repechage rounds for the men's 200 and women's 400.

In the men's 110 hurdles repechage, Craig Thorne of Quispamsis, N.B., was fifth in his heat in 13.62 seconds and will not be part of Thursday's semifinal.

Only the top two advance from each heat and from Thorne's group that is American Freddie Crittenden (13.42) and Spain's