Switzerland's Roger Federer in action during the Wimbledon second round match against Slovakia's Lukas Lacko, All England Lawn Tennis and Croquet Club, London, Britain, July 4, 2018.

The 36-year-old Swiss did not face a single break point and struck 48 winners as he extended his winning streak to 26 successive sets at the All England Club.

Federer will next face Germany’s Jan-Lennard Struff, who edged past Croatia’s Ivo Karlovic in five sets.

Seven-time champion Serena Williams proved too powerful for Bulgarian Viktoriya Tomova in a 6-1 6-4 win as she continued her steady progress on her return to Wimbledon, having missed last year’s event after taking a maternity leave.

Serena’s sister Venus also progressed into the third round, but was forced to fight back from a set down to beat Romanian qualifier Alexandra Dulgheru 4-6 6-0 6-1.

The top seeds in the women’s draw continue to tumble as Australian Open champion Caroline Wozniacki suffered a 6-4 1-6 7-5 defeat by Russian Ekaterina Makarova.

The Dane became 11th women’s seed to exit on the first three days of the championships.