Roger Federer recorded just the second 'double bagel' whitewash of his career to reach the semi-finals of the ATP Gerry Weber Open on Friday.
The 17-time Grand Slam champion destroyed world No 156 Mischa Zverev 6-0 6-0 in just 39 minutes of action in Halle.
The only other time Federer produced the same result was against Argentine Gaston Gaudio at the Masters Cup in Shanghai in 2005.
Top-seeded Federer will next play either German veteran Tommy Haas - who beat Federer in last year's final - or Frenchman Gael Monfils for a place in the final.
The 31-year-old, who is searching for his first title of the year, now has 41 wins and just five defeats at Halle where he is also seeking his sixth title - his favourite tune-up for Wimbledon.