That sparked a run in which Djokovic won seven straight games, helping him to claim the second set 6-2. In the final set, the Serb again ran into a hefty lead as he coasted through to the last eight.
"Obviously these kind of conditions favour my game against his," he told Eurosport.
"It's very heavy, very muddy, it slows down. His big weapon is his serve and I managed to get a lot of serves back. It's completely different playing him in these conditions to when it's 35 degrees and sunny. Rain like this is characteristic for Paris at this time of year."