Djokovic labors past Kohlschreiber, reaches milestone at ATP Monte-Carlo Masters

Novak Djokovic of Serbia hits a return during the singles second match against Philipp Kohlschreiber of Germany at the Monte-Carlo Rolex Masters tennis tournament in Roquebrune Cap Martin, France, April 16, 2019. Novak Djokovic won 2-1. (Xinhua/Nicolas Marie)