Eight-time champion Roger Federer extended his Wimbledon winning streak to 26 successive sets with a routine victory over Lukas Lacko in the second round.
The Swiss, who is favourite to claim another title, won 6-4 6-4 6-1 against world number 73 Lacko.
Federer, 36, did not face a single break point and hit 48 winners.
The top seed will play Germany’s Jan-Lennard Struff, who edged past Ivo Karlovic in five sets, in round three.
Martina Navratilova is the only player to win nine singles titles.
“I played very well. I felt good out there and had less nerves than in the first round,” said Federer, who beat Dusan Lajovic in straight sets on Monday.
Serena & Venus Williams into third round
Seven-time Wimbledon champion Serena Williams raced into the third round in devastating style, while sister Venus joined her after a trickier encounter.
Serena, 36, was too powerful for Bulgarian qualifier Viktoriya Tomova in a 6-1 6-4 win as she continues to impress after time off to give birth.
Five-time champion Venus, 38, fought back to beat Romanian qualifier Alexandra Dulgheru 4-6 6-0 6-1.
Serena, seeded 25th, faces Tatjana Maria or Kristina Mladenovic next.
“I’m going in the right direction,” Serena said. “In the other [first-round match] I didn’t move a lot. I’ve been moving a lot better.
“But I’m trying not to put too many expectations on myself.”
Venus, who has reached the third round for the 18th time, plays Kiki Bertens in the third round.
“It is just about winning the match. If you are at your best or not doesn’t matter as long as you win,” ninth seed Venus told BBC Sport.