Heat, humidity combine to harpoon Halep

Swiss teen Belinda Bencic outlasted Simona Halep to win Sunday's WTA Rogers Cup final when the Romanian second seed retired trailing 7-6 (5), 6-7 (4), 3-0.

Bencic, who upset world No 1 Serena Williams in the semifinals, broke twice to open the third set before the effort of battling in extreme heat and humidity proved more than Halep could take.

The 18-year-old Swiss has won 21 of her past 25 matches and defeated four top-10 foes this week, improving to 6-1 this year against such high-ranked rivals.