Seven-time champion Roger Federer swept aside 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 235km/h ace in the third game. It has been a hot week the first week but thankfully I have had easy matches going through without too many long four or five setters Roger Federer Federer will next face Spanish 20th seed Roberto Bautista Agut for a place in the quarter-finals. “I am very happy. It has been a hot week the first week but thankfully I have had easy matches going through without too many long four or five setters,” said Federer. “Now there are only big matches.” 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. Brown came through qualifying at Wimbledon but defeat on Saturday meant a swift return to the daily grind. “The schedule is to go to the airport and take the earliest flight, because I have club matches in Cologne, Germany,” said the 30-year-old. US Open champion Marin Cilic took just two games to see off John Isner after returning to finish off their third-round match poised at 10-10 in the final set. 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 on Friday due to bad light. “I was playing really good [on Friday] 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. 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.