WATCH: Federer and Serena match on, Venus bows of Wimbledon
Top seed and defending champion Roger Federer continued his serene run at Wimbledon as he strolled into the last 16 with 6-3, 7-5, 6-2 win over Germany's Jan-Lennard Struff on Friday.
The 36-year-old Swiss, chasing a ninth title at the All England Club, extended his winning streak to 29 sets in a row.
Federer will next face French 22nd seed Adrian Mannarino, who edged past Russian Daniil Medvedev 6-4, 6-3, 4-6, 5-7, 6-3.
In the women's draw, seven-time winner Serena Williams overcame her first big test in confident fashion by beating France's Kristina Mladenovic 7-5, 7-6.
The 36-year-old American has progressed to the second week without dropping a set but her sister Venus became the eighth of the top 10 seeds to be knocked out of the championships.
Venus, seeded ninth, was beaten 6-2, 6-7, 8-6 by Dutchwoman Kiki Bertens on Court One.
Earlier in the day, US Open finalist Madison Keys also struggled to find her rhythm in her 7-5, 5-7, 6-4 defeat by Russian qualifier Evgeniya Rodina.