Novak Djokovic overcame a slow start on Monday at the French Open to reach his 16th consecutive Grand Slam quarterfinal by beating Philipp Kohlschreiber 4-6, 6-3, 6-4, 6-4.

After losing a set for the first time in the tournament, Djokovic became more aggressive, punctuating winners with lots of fist-pumping as he pulled away.

Djokovic will next play 35-year-old Tommy Haas, who became the oldest French Open men’s quarterfinalist since 1971 by beating Mikhail Youzhny 6-1, 6-1, 6-3.

Roland Garros is the only Grand Slam that Djokovic has yet to win.

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