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
alone as he outgunned Lu 4-6 7-6(4) 6-7(4) 7-6(5) 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," he joked.
"I have to work a bit more on my serve, I guess."
(Reporting by Simon Cambers; Editing by Greg Stutchbury)
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