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Ivo Karlovic powers into second round

Ivo Karlovic hits 21 aces on the way to a comfortable victory over Federico Delbonis in the opening round of the US Open.

Ivo Karlovic has booked his place in the second round of the US Open with a straight-sets win over Federico Delbonis.

Ivo Karlovic of Croatia hits a return to Federico Delbonis of Argentia during their US Open 2015 first round men's singles match at the USTA Billie Jean King National Center September 1, 2015© Getty Images

The big-serving Croatian fired down 21 aces on the way to a 6-3 7-5 7-5 victory over the Argentine.

The 21st seed had as many as eight break-point opportunities during the opening set, but he was only required to take one of them to move into the lead.

Delbonis had chances to break Karlovic in both the second and third sessions, but at the end of each set, he dropped his own serve to allow the veteran to secure his place in the last 64.

The 36-year-old will now face Jiri Vesely on Thursday.

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Darren Plant
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