The top-seeded Djokovic outpaced his German counterpart 6-3, 6-2, 6-2 in his fourth round match at Roland-Garros. The Serbian took 1:33 to dispatch of Struff. Djokovic is looking to win his second French Open title and first since 2016.
Djokovic had just one break point to save in the victory. He will battle No. 9 Fabio Fognini or No. 5 Alexander Zverev in the quarterfinals.
Roger Federer battles Stan Wawrinka and Kei Nishikori takes on reigning champion Rafael Nadal in the quarterfinals on Tuesday at Roland-Garros. Nishikori beat Benoit Paire in a two-day, five-set round of 16 match, concluding Monday in Paris.