Argentinian Diego Schwartzman provided the day's biggest upset at the Rogers Cup when he took down third seed Dominic Thiem in a nearly three-hour battle on Tuesday.
Schwartzman climbed out of a 5-2 deficit in the decisive set, repeatedly escaping trouble, to win five straight games and pull off the victory 6-4, 6-7(7), 7-5.
Earlier, American Sam Querrey overcame a sluggish start to defeat Frenchman Vincent Millot 4-6, 7-6(4), 7-5. The battle was the second meeting between the pair in a week after Querrey defeated Millot in straight sets at the Los Cabos Open on Thursday, a tournament the American won.
Earlier on Tuesday, Czech Tomas Berdych, the number 10 seed, withdrew from the tournament prior to his first round match against Nikoloz Basilashvili citing a rib injury.
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