Ivo Karlovic served his way into the US Open record books on Tuesday when he fired 61 aces in his 4-6, 7-6 (7/4), 6-7 (4/7), 7-6 (7/5), 7-5 win over Lu Yen-Hsun of Taiwan.

Karlovic, 37, beat the previous best of 49 aces for one match in New York served up by Richard Krajicek in his quarter-final loss to Yevgeny Kafelnikov in 1999.

The giant Croatian already holds the career record for aces having last year passed the previous all time mark of 10,237 held by Goran Ivanisevic.