Novak Djokovic could be vulnerable against Janko Tipsarevic in tonight's Toronto Masters semi-finals.
As ever Djokovic is the overwhelming favourite with the bookies but Tipsarevic has beaten him twice in the past year and as such it could be worth backing him tonight.
He's 5/1 to win with Boylesports which is surely worth a shot given that he's beaten Djokovic at the ATP World Tour Finals and the Madrid Masters in the past year. Ok, Djokovic wasn't 100% in London and he didn't like the blue clay but he's unlikely to be at his very best today after two draining matches yesterday.
Tipsarevic will definitely be fresher after easing past Marin Cilic and Marcel Granollers while Djokovic was kept on court until the small hours of the morning as he battled Tommy Haas in the last eight.
Tipsarevic used to struggle against his compatriot but he's grown in confidence since he cracked the top ten last year and even at the US Open, he pushed Djokovic mightily hard in the quarter-finals.
Djokovic won't be relishing this one and you may even want to take up bet365 on the 11/1 they're offering on a Tipsarevic win in three sets.