Stan Wawrinka, who needed five sets to get through his first-round match at the Australian Open, had an easier time in the second round.
The fourth-seeded Swiss player dumped 33rd-ranked American Steve Johnson 6-3, 6-4, 6-4 on Wednesday at Melbourne, Australia.
Johnson, 27, is still looking for his first Grand Slam quarterfinal appearance. His best result in a major tournament was reaching the fourth round at Wimbledon last summer.
In other second-round action Wednesday, fifth-seeded Kei Nishikori of Japan rolled past France's Jeremy Chardy 6-3, 6-4, 6-3. Chardy finished with more winners in the match, 23-21, but had a huge edge in unforced errors 53-30.
Tenth-seeded Tomas Berdych of the Czech Republic eliminated American Ryan Harrison 6-3, 7-6 (6), 6-2, while France's Jo-Wilfried Tsonga, the 12th seed, knocked out Serbia's Dusan Lajovic 6-2, 6-2, 6-3.
The Wednesday schedule also featured 17th-seeded Roger Federer against American Noah Rubin, while top-seeded Andy Murray of Great Britain was set to face Russia's Andrey Rublev. Three seeded Americans -- No. 19 John Isner, No. 23 Jack Sock and No. 31 Sam Querrey -- were also due to play second-round matches.