The tallest player on the ATP Tour - Ivo Karlovic bombed a record-breaking 61 aces on his way to a First Round victory over Taiwan's Lu Yen-Hsun at the US Open. The 37-year-old Croat, who has served the most aces in ATP Tour history with well over 11,000, hit 22 in the Second Set itself as he outgunned Lu 4-6, 7-6 (4), 6-7 (4), 7-6 (7), 7-5 .

Tuesday's total beats the previous record of 49 set by the Dutchman, Richard Krajicek, in the quarter-finals in 1999. “I knew there were a lot of aces because at one stage I was serving one on almost every point but I didn't know it was a record,” 21st seed Karlovic told reporters.

Only 10 of the aces came in the final set but Karlovic broke to win the match. “I'm getting old and I have to work a bit more on my serve, I guess,” he jokingly said. ALSO READ: US OPEN MEN´S SINGLES: Wawrinka and Dimitrov wins in straight sets, Donaldson stuns Goffin