Wimbledon 2013: Jo-Wilfried Tsonga adds to list of walking wounded as he withdraws during match But Gulbis, who attracted headlines at last month's French Open when he accused the top men's players of giving "boring" interviews and calling for "war, blood, emotion" on court, showed some fight of his own as he stepped up his game in the second set, twice breaking Tsonga's serve and finding greater accuracy with his own. The sixth game provided a pivotal moment when Gulbis had a successful challenge after his forehand was called long by the line judge, giving Tsonga an apparent break of serve. Gulbis's challenge appeared more in hope than expectation, and Tsonga was already asking for the balls to begin his service game, but the Hawkeye replay showed the ball was fractionally in. Gulbis took advantage by holding his serve and then breaking Tsonga in the net. At 5-3, Gulbis promptly broke Tsonga again, with the Frenchman contributing to his own downfall by serving back-to-back double faults. It appeared that Tsonga was succumbing to the loss of concentration that has been a familiar aspect of his career over the years, though the problems were clearly physical rather than psychological. Although there was no single incident or fall that appeared to account for his injury, Tsonga revealed later that a tendon problem was becoming progressively more painful and he had no choice to call a halt after the fourth set. "I had this five or six days ago," he said. It was not a good sign and I know when it's getting worse and worse. It's not really good for me to play on because I know it will do even more damage. I thought it was getter to stop.