Posted February 29, 2012 on AP on Fox

MELBOURNE, AUSTRALIA - JANUARY 24: John Isner of the United States of America plays a forehand in his fourth round match against Andy Murray of Great Britain during day seven of the 2010 Australian Open at Melbourne Park on January 24, 2010 in Melbourne, Australia. (Photo by Ryan Pierse/Getty Images)
Top seed John Isner captured a 6-3, 6-4 win over fellow American Ryan Sweeting on Wednesday to move into the Delray Beach International Tennis Championships quarterfinals. The 11th-ranked Isner struggled through his first round win over wildcard recipient Jesse Levine on Tuesday because of the humidity, but was in better shape playing Sweeting. ''Whenever, in the past, when I've played tournaments in humidity I've always struggled because I hadn't acclimated yet,'' Isner said. ''But tonight I felt so much better than I did yesterday. ''I'm still not all the way there. I could feel better out there but it was so much better.'' Isner broke Sweeting's serve twice in the match - in the second game of the first set and the fifth game of the second set - which was all he needed to take the win. Sweeting was unable to capitalize on five break points when Isner kicked his potent serve into overdrive to save the points. ''A lot of times for me to be successful I'm going to have to have...
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