Third seed Cilic, who received a bye in the first round, ended a four-match losing streak since November to remain on course for his 19th ATP singles title.
Australian Open 2020: Rafael Nadal keeps it simple to avoid blip, Gael Monfils sets up clash with Dominic Thiem
Nadal explained, after beating fellow Spaniard Pablo Carreno Busta 6-1, 6-2, 6-4 on a warm Saturday afternoon, how he couldn't sleep until after Federer had clinched a fifth-set super tiebreaker on Friday night
Australian Open 2020: Safwat played better on big points, admits Sumit Nagal after shock loss in qualifiers
Nagal considers himself lucky to have a few sponsors and some sort of backing in the form of the Virat Kohli Foundation and Indian Oil.
Australian Open 2020: Prajnesh Gunneswaran enters main draw as lucky loser after going down in final round of qualifying
Prajnesh, ranked 122nd in the world and seeded 17th in the qualifiers, lost 6-7 (2), 2-6 to Gulbis in his final round qualifying match.
Australian Open 2019: Stefanos Tsitsipas' evolution with each passing match is giving tennis fans plenty to savour
Is it a little scary, then, that Stefanos Tsitsipas has already started turning his weaknesses into strengths, before he has even turned 21?
Maharashtra Open 2019: Ramkumar Ramanathan falls short of memorable win over Malek Jaziri; Ernests Gulbis ousts Hyeon Chung
Ramkumar Ramanathan came close to an incredible win over fourth seed Malek Jaziri in a nervy match, while Ernests Gulbis stunned second seed Hyeon Chung.
Maharashtra Open 2019: Kevin Anderson earns hardfought straight sets victory; Gilles Simon enters quarter-finals with comeback win
South African Kevin Anderson, 32, served 20 aces against 23-year-old Djere, who is ranked 93rd in the world singles chart, and won both sets in tie-breaks.
Swiss Indoors: Roger Federer beats Jan-Lennard Struff in straight sets to win 17th consecutive match in Basel
Despite extending his streak at the competition and dispatching Jan-Lennard Struff, Roger Federer admitted he was not satisfied with his slow start, going down a break in the third game.
Swiss Indoors: In-form Stefanos Tsitsipas beats Jeremy Chardy; Marin Cilic crashes out against Marius Copil
Second seed Alexander Zverev notched his tour-leading 50th win of the season as he brushed past Robin Haase as Stefanos Tsitsipas beat Jeremy Chardy in straight sets.
Stockholm Open: Stefanos Tsitsipas eases past Ernests Gulbis in straight sets to become first Greek man to win ATP title
Stefanos Tsitsipas became the first Greek man to win an ATP title on Sunday with a 6-4, 6-4 victory over Ernests Gulbis in Stockholm, ending the Latvian player's perfect record in finals.
Wimbledon 2018: Kei Nishikori calls quarter-final against Novak Djokovic 'big war', hopes to overturn 13-2 losing record
Nishikori, 28, overcame an arm injury to reach his first All England Club quarter-final with a 4-6, 7-6 (7/5), 7-6 (12/10), 6-1 win over Latvian qualifier Ernests Gulbis
Wimbledon 2018: World No 1 Rafael Nadal beats Jiri Vesely to reach quarter-finals; Roger Federer cruises past Adrian Mannarino
Defending champion Roger Federer and Rafael Nadal closed in on a dream Wimbledon final as the sport's two greatest players swept into the last-eight on Monday.
The 28-year-old Kei Nishikori is the first Japanese man to reach the quarter-finals at Wimbledon since Shuzo Matsuoka in 1995.
Wimbledon 2018: Why Alexander Zverev’s defeat to Ernests Gulbis does not fit his losing pattern at Majors
Zverev, no doubt, has a Major problem on his hands. But this result had little to do with his head and more to do with Gulbis, who lives to slice and dice another day.
Wimbledon 2018: Simona Halep, Alexander Zverev crash out; Rafael Nadal, Novak Djokovic progress to fourth round
German fourth seed Alexander Zverev and women's World No 1 Simona Halep wilted in 33-degree heat and crashed out of Wimbledon in the third round on Saturday.
Wimbledon 2018: Alexander Zverev beats Taylor Fritz in tough second round battle to avoid shock exit
After enjoying the best Grand Slam run of his career when he made the French Open quarter-finals last month, Zverev is hoping to reach the last eight at Wimbledon for the first time.
French Open 2018: Serena Williams' return to Roland Garros puts focus on effects of parenthood on players
Serena Williams' comeback has highlighted the fact that women who return after having a child are treated the same way as those sidelined by injury.
French Open 2018: New father Ernests Gulbis says he's focused on tennis after win against Gilles Muller
Latvian free spirit Ernests Gulbis, now a proud father, knows that time to make his undoubted on-court talents count is rapidly running out.
Dubai Tennis Championships: Grigor Dimitrov shocked by unheralded Malek Jaziri, Lucas Pouille through to next round
The fourth-ranked Dimitrov was far from his best, perhaps still not fully recovered from the illness which bothered him this month as he lost the Rotterdam final to Roger Federer.
Here's a close look at how Rafael Nadal and Kevin Anderson made it to the men's singles final of US Open 2017.