Novak Djokovic was given a scare in his North American hardcourt season opener but managed to prevail with a 7-5, 7-6(3) victory over Luxembourg's Gilles Mueller on Wednesday to reach the third round of the Rogers Cup.
Frenchman Benoit lost his temper in the third game of the second set when top seed Tsitsipas halted the match to attend to a broken shoe lace.