John Robert Isner (born April 26, 1985) is an American professional tennis player. He achieved his career-high rank of no. 9
ROME, ITALY - MAY 12: Denis Istomin of Uzbekistan plays a forehand against John Isner of the USA in their first round match during day one of the Internazionali BNL d'Italia 2013 at the Foro Italico Tennis Centre on May 12, 2013 in Rome, Italy.
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