Iga Swiatek remained on course for her first Australian Open title after another demolition, while the Pole dismissed German lucky loser Eva Lys to drop just one game.
Swiatek advanced to the quarter-finals at Melbourne Park for the second time by coming through in straight sets 6-0 6-1.
The five-time Grand Slam champion has dropped only 11 games in her four matches so far, seven of which she lost in the first round to Katerina Siniakova.
“Great, it was my first night session and I'm glad to have the opportunity to play at Rod Laver Arena,” said Swiatek.
“I enjoyed it, most importantly, I'm still 23 years old, so I have a lot to improve. I don't feel at my peak. But these matches give me a lot of confidence.
“We don't know what will happen in the future, maybe I'll be better. I'm glad I was able to play my game. I feel very comfortable and we're going well.”
World number 128 Lys enjoyed a historic run after replacing Anna Kalinskaya in the main draw after losing in the qualifiers, but the Kiev-born player was in for more suffering.
Lys managed a smile and clenched her fist as she led 40-30 after taking the first three games and soaked up loud applause after climbing the board to ensure she avoided the dreaded double bagel.
Swiatek broke for the fifth time after a game of six deuces and served in style to set up a last-eight match with Emma Navarro.
The American eighth seed had marathon contests in every round, and in the last she defeated Daria Kasatkina 6-4 5-7 7-5.
Swiatek's drug conviction will not be appealed
The World Anti-Doping Agency will not appeal Swiatek's one-month suspension for failing a drug test
The World Anti-Doping Agency will not appeal Swiateka's one-month suspension for failing a doping test because her explanation is “convincing”, WADA said on Monday.
WADA announced its decision just minutes after Swiatek's victory at Rod Laver Arena against Lys.
The Polish woman was the first in the world to provide a sample containing the angina drug trimetazidine in an out-of-competition test on August 12.
The The International Tennis Integrity Agency (ITIA) accepted the player's explanation that contaminated drugs were the cause of the positive testwith Swiatek's fault level therefore considered to be at the low end of the range for 'No significant fault or negligence'.
Unlike the Swiatek case, WADA has appealed against current Premier League player Jannik Sinner's discharge, with a hearing scheduled at the Court of Arbitration for Sport (CAS) in Lausanne in April.
Sinner was not suspended because the International Tennis Integrity Agency (ITIA) found he was not negligent for two positive anabolic steroid tests in March.
Svitolina advanced to her 12th Grand Slam quarterfinal
Elina Svitolina recovered from a bad start and reached her 12th Grand Slam quarterfinal
Elina Svitolina was happy to bring some light to Ukraine with a win over Russian Veronika Kudermetova in the fourth round.
Svitolina, who has refused to shake hands with Russian or Belarusian opponents after matches since the start of the war almost three years ago, recovered from a poor start to win 6-4 6-1 to reach her 12th Grand Slam quarter-final.
“This fighting spirit that I have is a completely Ukrainian spirit that I'm trying to show, that I'm also trying to represent,” she said.
“Especially these days in very difficult days for Ukraine. The war has been going on for almost three years. Of course, on a daily basis, it is a very heavy backpack that all Ukrainians have on their backs.
“For me, finding a way to win matches, to bring a little light, a little victory for the Ukrainian people, is something I feel responsible for. Bringing the fight is the least I can do.
“I feel like sometimes people forget that it's still a war, that we still need help. It's just very important for me to show resilience, to show that I'm here to fight no matter what.”
The 30-year-old, playing in her first tournament since undergoing foot surgery last September, has won all eight matches she has played against Russian opposition since Russia invaded Ukraine in February 2022.
For me, it's the same routine I have in the morning, before the matches, said Svitolina.
“It's all the same. I just feel like the spirit is different. I really, really put everything out there. I feel like I put all my energy out there. If I'm not going to win, I'm going to almost die on the court. I'm not going to let her win that easily.
“So I feel like this fighting spirit really pulls me through these matches. It's just the associations that I personally have with this country. It's very painful and it's very heavy on my heart. So of course I have extra motivation for this.”
In the round of 16, Svitolina will play against the in-form American Madison Keyswho upset sixth seed Elena Rybakina 6-3 1-6 6-3.
Keys won the warm-up in Adelaide and played brilliantly to beat the former finalist, who struggled with a back problem in the previous match.
Rybakina has been playing under a cloud of uncertainty surrounding coach Stefan Vukov, whom she rehired earlier this month but who could not be accredited because he has been temporarily banned by the WTA pending an investigation into a potential breach of its code of conduct.
“Definitely, like I said before, this is not a situation I want to be in or anybody wants to be in,” Rybakina said. “Of course I want to have whoever I want in the box, but I couldn't change that.
“At the end of the day, I just tried to focus on my matches, and I talked to him. I also have Goran (Ivanišević), so it didn't affect the way I played today or any results, I think.”
In girls' singles, the ninth seed Mingge Xu she became the first British player to reach the third round, the Welshwoman beating Romania's Diana-Ioana Simionescu 7-6 (7-3) 6-2.
Watch the ATP and WTA Tours, as well as the US Open in New York, live on Sky Sports in 2025 or stream from NOW and The Sky Sports appgiving Sky Sports customers access to over 50 per cent more live sport this year at no extra cost. Learn more here.