CINCINNATI (AFP) - Top seed Daniil Medvedev reached the ATP and WTA Cincinnati Masters quarter-finals on Thursday (Aug 19) with a 6-3, 6-3 victory over fellow former champion Grigor Dimitrov. The Russian world number two stretched his record against the Bulgarian to 3-1. Medvedev won the Cincinnati title in 2019 while Dimitrov took the trophy at the key US Open warm-up event in 2017. Medvedev, the champion in Toronto last weekend, will next face Spaniard Pablo Carreno Busta, who defeated ninth seed Hubert Hurkacz of Poland 7-6 (8/6), 7-6 (7/3). “What makes it tough, it’s two weeks in a row against the best players in the world,” Medvedev said. “I’m still young, healthy and feeling 100 per cent, so that is why I want to try and do it.” Medvedev had to deal with the draining heat and summer humidity during his 90-minute win. The 25-year-old from Moscow fired a modest seven aces and broke four times. Benoit Paire took advantage of John Isner’s failing fitness with a 7-6 (7/1), 6-7 (2/7), 6-1 triumph to move into the last eight. The moody Frenchman, struggling for motivation at the fan-free events which have characterized much of the Covid-19 tennis era, came alive with the Cincinnati stands at full capacity and masks a rare sight. Isner, who won the Atlanta title and got to the Toronto semi-finals at the weekend, appeared unable to cope with the demanding conditions. “I’m glad to win. It was not easy out there,” Paire said. “It makes all the difference, though, to play in front of fans.” Isner began the third set with three double-faults in a row to lose serve and from then on was barely able to lift his racquet against Paire, who has never been this far at Cincinnati. The 50th-ranked Frenchman worked for almost two and a half hours to advance despite producing 20 double-faults – just three off his all-time “record” of 23 during a first-round loss at the Australian Open in February. Isner just barely out-aced his opponent 18 to 16 and was hardly able to stretch his racquet in the closing stages as his resources drained away. Third-seeded Olympic gold medalist Alexander Zverev got past Argentine Guido Pella with a comfortable 6-2, 6-3 result in 73 minutes while never facing a break point. No. 1 Barty advances In the women’s draw, top-ranked Ashleigh Barty powered into the quarter-finals 6-0, 6-2 over Victoria Azarenka. The top seed from Australia, playing her first event since an opening-round Tokyo Olympic loss, needed 72 minutes to advance as she works to find hard-court form in her only US Open run-up event. More on this topic   Related Story Tennis: Lucky seventh as Zverev finally wins at Cincinnati, Medvedev and Tsitsipas also through   Related Story Tennis: Halep pulls out from WTA Cincinnati event with thigh injury “I was able to look after my own service games pretty well,” Barty said. “Sometimes a scoreline in tennis can fool you. “Even though it was quite a convincing score, for most of that match, each and every game there were crucial points. “I felt like I was able to win a lot of those big points today. Getting ahead early in games was really helpful.” Two-time grand Slam winner Azarenka won the title a year ago, when it was played in New York on the site of the Open in front of empty stands due to Covid-19 restrictions. Barty improved to 13-1 over top-20 opponents this season and will next face off against fellow French Open champion Barbora Krejcikova, who beat Garbine Muguruza 6-1, 6-7 (5/7), 6-2. Anelique Kerber marked her 10th Cincinnati appearance by defeating Jelena Ostapenko in a 4-6, 6-2, 7-5 fightback.