MONTREAL (TIP): Novak Djokovic dropped the opening set but recovered quickly to earn a 2-6, 6-4, 6-4 win over Denis Istomin to reach the quarterfinals of the Montreal Masters. The top seed was ambushed by two breaks in the opening set by the Uzbek player. Djokovic, winner of the last two editions in Canada, notched his 12th straight victory at the tournament. He is bidding for a fourth career trophy here after also winning in 2007. He plays on Friday against French seventh seed Richard Gasquet, who beat Japan’s Kei Nishikori 1-6, 6-3, 6-3.