London, July 4

Seven-time champion Roger Federer defeated big-serving Australian Sam Groth to reach the Wimbledon last 16 on Saturday while Dustin Brown, the conqueror of Rafael Nadal returned to earth with a bump.

Second seed Federer clinched a 6-4, 6-4, 6-7 (5/7), 6-2 victory over world number 69 Groth who fired a 147mph ace in the third game. Federer will next face Spanish 20th seed Roberto Bautista Agut for a place in the quarter-finals.

Dreadlocked German qualifier Brown was unable to follow his triumph over Nadal when he slumped to a 6-4, 7-6 (7/3), 4-6, 6-3 defeat to Serbian 22nd seed Viktor Troicki. Brown joins Lukas Rosol, Steve Darcis and Nick Kyrgios who all lost their next match at Wimbledon after knocking out Nadal over the last four years. Troicki goes on to face either British wildcard James Ward or Canada’s Vasek Pospisil for a place in the quarter-finals. It is the 29-year-old Serb’s first last-16 run at Wimbledon since 2012 and his best performance at a Grand Slam since returning from a 12-month drugs ban in July last year.

Croatian Cilic, the ninth seed, beat the US 17th seed 7-6 (7/4), 6-7 (6/8), 6-4, 6-7 (4/7), 12-10 on Court One in a match that lasted four hours and 31 minutes in total after it had been suspended late Friday due to bad light. “I was playing yesterday really good and I was close to finishing it off. I think throughout all the match I was the one who was putting more pressure on the returns,” Cilic said after winning on a fifth match point having had a first match point in the 12th game of the decider on Friday. Cilic sent down 35 aces to Isner’s 37 and next faces wildcard Denis Kudla, the last American man in the tournament, for a place in the quarter-finals.

Danish fifth seed Caroline Wozniacki reached the last 16 for the fourth time with a comfortable 6-2, 6-2 win over Italy’s Camila Giorgi. “I was very happy to win this one. I know that Camila is such a tricky opponent. She hits so hard. I was just trying to get every ball back. I was really pleased how I managed to keep my composure,” said Wozniacki. The former world number one will face Spain’s Garbine Muguruza after the 20th seed shocked 2012 semi-finalist Angelique Kerber 7-6 (14/12), 1-6, 6-2.

Muguruza, who made the French Open quarter-finals this year, saved nine set points in the opener on her way to a first appearance in the second week at Wimbledon. Romania’s Monica Niculescu also made the last 16 for the first time, beating Czech world number 134 Kristyna Plískova 6-3, 7-5. She will face Switzerland’s Timea Bacsinszky who put out 2013 runner-up Sabine Lisicki 6-3, 6-2 to book a spot in the last 16 for the first time.