Germany’s Laura Siegemund has won the longest women’s tour-level tennis match at the WTA Tour in 13 years. Siegemund defeated China’s Wang Xiyu 7-6 (7-3), 4-6, 7-6 (7-1) in four hours and nine minutes on Wednesday to reach the quarter-finals of the Thailand Open. “I’m happy that I won. I think it was a good match. Maybe there were a few moments, in which there were a few more mistakes, but overall we fought very hard,” Siegemund said. In the end, it was “just a battle” in which it was all about physical strength and mentality. According to the WTA, it was the first time since 2011 that two ten…