U.S. tennis player Robert Kendrick has been suspended for one year due to a positive test for a banned stimulant, international tennis officials said Friday. Kendrick, a 31-year-old ranked No. 105 in the world, tested positive for the stimulant Methylhexaneamine during the French Open. He admitted taking the substance but said it was in a capsule he took to fight jet leg and he wasn\'t seeking a performance advantage. Kendrick lost his first-round match in Paris. The International Tennis Federation accepted Kendrick\'s explanation but said a player is responsible for any substance he consumes. Kendrick will be banned from competition until May 21, 2012. Kendrick has been ranked as high as 69th in his career. A professional since 2000, he\'s never won an ATP tournament and never advanced beyond the second round of a Grand Slam event.