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Tennis balls sit in a trolley as boys practice at Green Tennis School in Matsue, Shimane Prefecture, on Tuesday, Sept. 9, 2014. In Matsue, Japanese Tennis Player Kei Nishikori's home town, thousands of supporters had gathered at Kunibiki Messe on Sept. 9 to cheer their native son on in the match against Croatia's Marin Cilic, which lasted 1 hour and 54 minutes, about half the average of just over 4 hours for the past five U.S. Open finals. Photographer: Kiyoshi Ota/Bloomberg via Getty Images

Tennis balls sit in a trolley as boys practice at Green Tennis School in Matsue, Shimane Prefecture, on Tuesday, Sept. 9, 2014. In Matsue, Japanese Tennis Player Kei Nishikori's home town, thousands of supporters had gathered at Kunibiki Messe on Sept. 9 to cheer their native son on in the match against Croatia's Marin Cilic, which lasted 1 hour and 54 minutes, about half the average of just over 4 hours for the past five U.S. Open finals. Photographer: Kiyoshi Ota/Bloomberg via Getty Images