Five-time champion Venus was a 4-6, 6-0, 6-1 victor against Alexandra Dulgheru while seven-time winner Serena defeated Viktoriya Tomova 6-1, 6-4.
The 36-year-old Swiss proceeded to win his 29th consecutive set at the All England Club and wrap up victory on Centre Court with an ace on his first match point in just over one and a half hours.
But it's business as usual for Federer as the defending champion took his consecutive sets won at Wimbledon to 29 in a third-round dismissal of Germany's Jan-Lennard Struff.
Federer's tie is one of 16 fourth round matches across the men's and women's events in a frenetic day of action at the All England Club.
"It was better than the first round".
"When you glance at the numbers, the ones that really stand out for me are 48 winners and 11 unforced errors", added the BBC Sport analyst.
"I'm getting there, I'm not there yet but I expect to get there not only for Wimbledon but for tournaments in the future". "I expected more from the team", Federer, who has given Switzerland plenty to cheer about as he collected 20 Grand Slam titles over the past 15 years, told reporters at Wimbledon on Wednesday.
Wozniacki has never been past the fourth round in her 12 visits to Wimbledon and required insect repellent to tackle a swarm of flying ants during her match.
"They're in my mouth and in my hair and everywhere - we need to do something".
The women's draw suffered another seed shock as No. 2 Caroline Wozniacki fell in three sets to Russian Ekaterina Makarova 6-4, 1-6, 7-5.
"The tougher balance is to be able to spend time away from my son and be okay with taking sometimes time for myself, which is a struggle, because I really want to spend every second with him". "It's throughout the year, it's not just in the World Cup, last 16 or quarters".
"Unbelievable. Crazy, crazy! I can't describe it". Like, crazy. I was scared to have my phone. It was jumping, screaming. "Everything. Beers, everything. It was great".
- Eugenie Bouchard salutes those who slept overnight to get tickets.
Lacko had probably hoped he could throw some curve balls Federer's way after enjoying a run to the Eastbourne final at the weekend. "That makes sense, right?"
Centre Court was treated to another display of sensational serving and genius groundstrokes as Federer outmatched Lacko with some of his finest work.
'I haven't played him on the grass.