Romanian second seed Simona Halep advanced to the semi-finals of the WTA Rogers Cup on Friday by roaring back to defeat Polish sixth seed Agnieszka Radwanska 0-6, 6-3, 6-1.

Halep next will face the winner of a later match between Ukraine's Lesia Tsurenko and Italy's Sara Errani.

World number one Serena Williams plays later against Italy's Roberta Vinci with that winner set to face either Swiss Belinda Bencic or Serbian fifth seed Ana Ivanovic in the semi-finals.

Radwanska won the first seven games of the match and looked in control.

But Halep battled to 3-3 in the second set and then seized command, winning eight games in a row to reach the brink of victory.

Radwanska held at love in the penultimate game but Halep matched her in the concluder to claim her 300th career singles victory after one hour and 40 minutes on the court.

"It was a tough match," Halep said. "She played an amazing first set. I couldnt move my legs first set. I made many mistakes. But I kept my concentration and a changed a few things and was able to come back."