Canadian teenager Bianca Andreescu won the Rogers Cup title after her opponent and former world number one Serena Williams was forced to retire in the final with a back injury on Sunday.

Watch: Bianca Andreescu 'consoling' crying Serena Williams wins internet

Novak Djokovic can become the tournament's first ever four-time winner when he meets Nishikori in Sunday's final

Djokovic beats Monfils, heads to Rogers Cup final

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Watch: Bianca Andreescu 'consoling' crying Serena Williams wins internet

Djokovic beats Monfils, heads to Rogers Cup final