WASHINGTON: US top seed John Isner and second-seeded defending champion Ivo Karlovic advanced to the quarterfinals of the ATP Hall of Fame Championships with straight-set triumphs Wednesday (Thursday in Manila) at Newport, Rhode Island.

Isner, the 2011 and 2012 winner at the grass-court event, fired 13 aces in defeating Australian qualifier Sam Groth 6-2, 6-4. The hard-serving American improved to 3-0 all-time against Groth, who dropped prior meetings in Davis Cup ties this year and last year, with the 61-minute triumph.

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