In the first semi-final of the French Open Men's Singles, now under way in Paris, Swiss eighth seed Stanlislas Wawrinka has won the first set against French 14th seed Jo Wilfrid Tsonga. In the second set, Wawrinka was leading 4-2, a short while ago.The second semi-final will be played between world number one and top seed Novak Djokovic and British third seed Andy Murray.