Novak Djokovic recorded his first 6-0, 6-0 win at an elite level event when he shut out Jan Hernych at the Swiss Indoors on Thursday.
The third-ranked Serb took just 53 minutes to beat his 59th-ranked Czech opponent in the second round.
"To win against somebody (with a) double bagel, an opponent has to play really, really bad," Djokovic said. "He didn't put a lot of effort in."
Djokovic has had a pair of 6-1, 6-0 wins in ATP Tour semifinals in the past two seasons.
He routed Andy Murray to reach the Miami Masters final in March 2007, and dispatched David Nalbandian in 48 minutes on grass at Queen's Club, London, last year.
The 30-year-old Hernych did create three break points in the first set, but Djokovic saved them all and won all eight points on Hernych's second serve in the opening set.
"It's funny at the end with the crowd wanting him to win a game. It's easy to understand that," said Djokovic, who offered no respite and converted his first match point. "We're professionals and he's my rival on the court."
Djokovic reached his 18th quarterfinal of the year. His one failure to reach the last eight since January was a third-round exit at the French Open.
Djokovic will play sixth-seeded Stanislas Wawrinka on Friday, after the Swiss defeated Finland's Jarkko Nieminen 7-5, 2-6, 6-1.
In other second-round action, fourth-seeded Marin Cilic and Richard Gasquet saved match points before winning three-setters.
Cilic needed more than three hours to oust Serbia's Viktor Troicki 7-6 (7), 6-7 (8), 7-6 (6). The Croat next plays fifth-seeded Radek Stepanek of the Czech Republic.
Gasquet's 4-6, 7-6 (9), 6-2 win over John Isner of the United States swung on a dramatic second-set tiebreaker. The Frenchman saved the second of Isner's two match points with one of his six aces to answer 22 from the 6-foot-9 (2.06-meter) American.
Gasquet earned a quarterfinal with Marco Chiudinelli, who edged Michael Lammer 2-6, 6-3, 6-3 in an all-Swiss match.
Evgeny Korolev of Russia beat Jeremy Chardy of France 6-4, 7-6 (1) and will play top-seeded Roger Federer on Friday.
