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Kei Nishikori of Japan defends his Memphis title by beating Ivo Karlovic 6-4, 7-6 (0)

  • c2a335efa33406064c0f6a70670020d3.jpg

    Kei Nishikori,of Japan, hits a return to Ivo Karlovic, of Croatia, in the singles final at the U.S. National Indoor Tennis Championships on Sunday, Feb. 16, 2014, in Memphis, Tenn. (AP Photo/Rogelio V. Solis)The Associated Press

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    Kei Nishikori, of Japan, hits a return to Ivo Karlovic, of Croatia, in the singles final at the U.S. National Indoor Tennis Championships on Sunday, Feb. 16, 2014, in Memphis, Tenn. (AP Photo/Rogelio V. Solis)The Associated Press

  • 2047233aa33506064c0f6a7067008dd1.jpg

    Kei Nishikori, of Japan, hits a return to Ivo Karlovic, of Croatia, in the singles final at the U.S. National Indoor Tennis Championships on Sunday, Feb. 16, 2014, in Memphis, Tenn. (AP Photo/Rogelio V. Solis)The Associated Press

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    Ivo Karlovic, of Croatia, serves to Kei Nishikori, of Japan, in the singles final at the U.S. National Indoor Tennis Championships on Sunday, Feb. 16, 2014, in Memphis, Tenn. (AP Photo/Rogelio V. Solis)The Associated Press

  • 381f662ba33306064c0f6a706700837d.jpg

    Ivo Karlovic, of Croatia, hits a backhand return to Kei Nishikori, of Japan, in the singles final at the U.S. National Indoor Tennis Championships on Sunday, Feb. 16, 2014, in Memphis, Tenn. (AP Photo/Rogelio V. Solis)The Associated Press

Kei Nishikori of Japan successfully defended his title at the U.S. National Indoor Tennis Championships, beating Ivo Karlovic of Croatia 6-4, 7-6 (0) on Sunday.

Nishikori won his fourth career title along with the $103,100 winner's check and 250 points on the ATP Tour by making this event at The Racquet Club his first successful title defense. He became the first back-to-back winner since Tommy Haas won in 2006 and 2007.

Karlovic came in having not been broken even once this week and looking for his sixth career title. The big-serving Karlovic and his 20 aces couldn't counter Nishikori's precision.

American Eric Butorac and Raven Klaasen of South Africa beat Bob and Mike Bryan 6-4, 6-4 for the doubles title. It's the second time this year Butorac and Klaasen have beaten the Bryans after knocking them out of the Australian Open in January.