New York: 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.