"I had to reload in the fifth", he said. "He's always been a top player". The U.S. Open champion defeated the unseeded Slovenian to set up an all-Asian clash with Hsieh Su-wei of Taiwan in the next round.
"I had a lot of ups and downs in 2018, and I'm trying to fix parts of my game", Chung said.
After dropping serve twice in the first set against Brengle, Pliskova completely dominated the second and third sets and capped it with a pair of aces.
Among other Japanese players, Taro Daniel lost 6-3, 7-6 (2), 6-3 to Canadian 25th seed Denis Shapovalov. I lost two easy games and he got the sets. Milos Raonic and 2014 champion Stan Wawrinka were level at one set apiece and 4-4 in the third when the rain suspended their second-round match.
Raonic delivered 39 aces, part of an impressive ratio of 84 total winners to only 44 unforced errors.
This was a matchup probably better suited to the second week than the second round of a Grand Slam tournament, given both men's credentials. But as even as the match was in many respects - Raonic won only two more points overall, 163-161 - Wawrinka couldn't come through when he really needed to.
Keys has reached the semifinals in three of the last five majors and is gaining in confidence in Australia.
Raonic had plenty to do with that, including in the third-set tiebreaker, when he served his way out of trouble.
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Nishikori, who dropped to his knees after hitting a service victor on match point, led 4-1 in the final-set 10-point tiebreaker but allowed Karlovic to take a 7-6 lead in it. A 123 miles per hour (198 km/h) service victor gave Raonic that set.
Japan's Kei Nishikori weathered a barrage of aces from towering Croat Ivo Karlovic on Thursday to advance to the third round of the men's singles at the Australian Open, while compatriot Naomi Osaka also advanced to the round of 32 in the women's bracket.
"I have to be happy to go to the next round because I nearly lost today".
Despite the massive deficit on serve - Karlovic rocketed 59 aces to Nishikori's nine - the Japanese appeared to have rounded into better form than he displayed in his narrow first-round victory over Polish qualifier Kamil Majchrzak, who retired with injuries midway through the fifth set Tuesday. "Never easy. Kind of frustrating if you can't get the serve like three in a row".
The 22-year-old, who was the 2017 ATP NextGen Finals champion, is now ranked 25 but will plummet when the new rankings are announced post-Melbourne and his points from last year drop off his record.
Raonic moves on to face Pierre-Hugues Herbert, who scored a 6-2, 1-6, 6-2, 6-4 victory over South Korea's Hyeon Chung, a semifinalist a year ago.