Danielle Collins kept her great summer run going Wednesday in Montreal where she stunned former No. 1 Simona Halep 2-6, 6-4, 6-4.

The 2-time champion Halep led with a break in the third 3-2 before Collins called a medical timeout on the changeover. She left the court due to her hip and upon returning broke right back and took three of the next four games.

“After playing a two-and-a-half-hour match, it would have been heart-breaking to have to pull the plug and I really wanted to get through the match, win or lose,” Collins said. “I thought we were both playing such good tennis, it was such a great match.”

Collins entered the event off of her first two WTA titles. She has now won her last 12 matches.

“I can’t remember when I’ve played this many matches, to be honest,” Collins said on court.

“Honestly, I just feel really lucky,” she later added. “Dealing with the physical stuff today after playing a lot of matches, it wasn’t easy. It definitely got the best of me physically and emotionally. So just being able to hang in there, just really proud to be able to pull through.”

Halep was playing her first match since Rome where she injured her calf.

“Very positive about how I played today,” said Halep. “A little bit unexpected because after three months that you cannot play much tennis, you come and play three hours at a very high level with someone that is winning lately matches and tournaments. So I’m really happy with the way I played.”

Top Aryna Sabalenka held off former Canadian finalist Sloane Stephens in a thriller 7-6(4), 4-6, 6-4. After taking the second, Stephens led 4-1 in the third before Sabalenka won the last five games.

“It was a tough match and she played so well. She pushed me like crazy in this match and I don’t know actually how I won this won this one,” Sabalenka told the crowd.

“I’m really happy with this win. I was already in the locker room thinking what was going to happen next. doubles here, planning for the next weeks. I don’t know if that’s why I cooled down, and I was just playing and didn’t think about anything else.”

No. 3 seed Elina Svitolina fell to Johanna Konta 3-6, 6-3, 6-2. Konta, who missed Wimbledon and the Olympics due to COVID, had never beaten Svitolina before.

Coco Gauff won all five games of her encounter with Anastasia Potapova before the Russian retired due to an ankle issue.

Gauff’s countrywomen Jessica Pegula and Amanda Anisimova also advanced.

Karolina Pliskova need a final set breaker to put away Donna Vekic. Maria Sakkari and Ons Jabeur were winners. And Rebecca Marino continued her first Canadian Open in 10 years upsetting Paula Badosa in three sets.