"Shut your mouth" - Maria Sakkari and Danielle Collins involved in heated argument during Canadian Open clash

Danielle Collins and Maria Sakkari were involved in a moment of drama during their second-round clash at the Canadian Open.

Sakkari, seeded eighth, received a walkover to the Round of 32 in Montreal. Collins meanwhile had to qualify for the main draw, and she beat World No. 26 Elina Svitolina 6-2, 6-2 in the opening round.

The American won the opening set against 6-4 and led 2-1 in the second, with her Greek counterpart serving. Sakkari made a first-serve fault at that point, which was returned by Collins. The World No. 8 then hit the ball outside the court, and it bounced once before ending up in the crowd.

Sakkari instantly raised her hand to apologise, and did not receive any warning. She was about to hit her second serve when Collins asked the chair umpire if she saw the Greek hitting the ball into the crowd.

"Did you just see that? Did you see what happened?" the American said.

Sakkari then told Collins that her ball didn't hit anyone.

"It didn't even hit anyone. It was on the ground," the Greek said.

Collins, in turn, told the Greek to shut her mouth.

"Shut your mouth. Shut your mouth," Danielle Collins said.

Sakkari continued to argue with her opponent, reiterating that her shot did not hit anyone.

"What is your problem? I didn't hit anyone. I framed the ball," the Greek said.

Collins then told her that she almost hit someone with her shot.

"You hit the ball into the stands Maria, you almost hit someone," the American stated.

The two argued in circles before the chair umpire intervened and play resumed.

Danielle Collins ended up having the last laugh as she dominated the second set too to win 6-2 and book her place in the third round of the Canadian Open.

Danielle Collins will face Leylah Fernandez in the third round of the Canadian Open

Danielle Collins in action at the Canadian Open

After ousting Maria Sakkari, Danielle Collins will now face Leylah Fernandez in the third round of the Canadian Open.

Fernandez, who received a wildcard for the main draw of the WTA 1000 event, beat Peyton Stearns 6-3, 6-4 in the first round. She then triumphed 7-5, 5-7, 6-3 over last year's runner-up and 11th seed Beatriz Haddad Maia to book her place in the Round of 16 in Montreal.

Collins and Fernandez will lock horns on the WTA Tour for the very first time. The winner of the match will face either top seed Iga Swiatek or 14th seed Karolina Muchova in the quarterfinals of the Canadian Open.