Jessica Zelinka of London, Ont., came second in her heat with a time of 12.75 seconds to earn her spot in the next round, trailing Alina Talay from Belarus (12.71) in the race.
"I woke up a little sore," Zelink said. "I didn't train yesterday, took the day off after the heptathlon so today this was my warm up to find my legs."
Zelinka is looking to rebound from a seventh-place finish in the heptathlon over the weekend. She was looking for a top-three finish in her heat and did just that.
"I was like, hey body you’re not done yet," she said. "I followed the same routine and rhythm but I knew the time would be a little slower."
Phylicia George of Markham, Ont., and Nikkita Holder of Pickering, Ont., also qualified for the next round.
"I left a lot on the track, got the rust off though, I hadn't raced in awhile," said George. "I can go a lot faster; it's going to take 12.6 seconds to make the final, then a personal best to step on the podium."
George was second in her heat with a time of 12.83, while Holder advanced with a qualifying time of 12.93.
“It wasn't my best race or start," Holder said. "I'll get through on time and fine tune some things for the semi final."
Harris runs personal best, advances in 800m
Geoff Harris of Halifax advanced to the semifinals in the men’s 800 metres.
He ran a personal best time of one minute 45.97 seconds. The 25-year-old heads into the next round with with the sixth best qualifier.
Harris felt comfortable in the race and says he has more left in the tank.
"There's definitely more there. I've got another gear for sure," he said. "Speed wise I can run with best. I was patient, I knew they would come up on me, got boxed in a bit but I didn't panic and just ran my race, that was the key."
Sudan's Abubaker Kaki had the top qualifying time of 1:45.51.
The semifinal race takes place on Tuesday.
Stellingwerff, Sifuentes reach women's 1,500m semis
Two Canadians advanced to the semifinals of the women's 1,500m on Monday.
Hilary Stellingwerff of Grand Bend, Ont., had the sixth-best qualifying time of four minutes 5.79 seconds. Winnipeg’s Nicole Sifuentes ran a time of 4:07.65 to reach the next round.
Ethiopia's Abeba Aregawi led the field with a time of 4:04.55.
Emmanuel through to 200m semis
Scarborough's Crystal Emmanuel has advanced to the semi-finals in the women's 200 metres thanks to a season-best 23.10 on Monday night.
The 20-year-old student was in a fast heat that featured star Shelly-Ann Fraser-Pryce, who cruised to a win in 22.71 but pulled everyone else along with her.
Semi-finals go on Tuesday.
Wells out of 400m hurdles
Sarah-Lynn Wells will not advance to the finals of the women's 400m hurdles.
The 22-year-old Markham resident struggled in heat two of the semi-finals, posting a 56.71, a second slower than her personal best set earlier this season.
Her heat was won by Lashinda Demus of the United States, in 56.71.