Paris - Former French Open champion Stan Wawrinka and two runners-up will complete their fourth-round matches on Monday at Roland Garros.
Wawrinka won the title in 2015.
The third-seeded Swiss, a three-time Grand Slam champion, faces 15th-seeded Gael Monfils on Court Phillipe Chatrier.
Andy Murray, last year's runner-up, is also on Chatrier.
The three-time Grand Slam champion has never won at Roland Garros, and never faced unseeded Russian Karen Khachanov, either.
Third-seeded Simona Halep, the 2014 runner-up, faces No 21 Carla Suarez Navarro.