Tennis-Tsonga through to last eight after Gasquet retires hurt

LONDON, July 4 (Reuters) - Jo-Wilfried Tsonga won his fourth-round match at Wimbledon on Monday when his fellow Frenchman Richard Gasquet retired with a back injury with the score at 4-2 in the first set. Tsonga, who won a marathon match at the weekend against John Isner 19-17 in the final set, was a break up against number seven seed Gasquet when the match was ended. The 31-year-old, seeded number 12, will play either Andy Murray or Nick Kyrgios in the quarter-finals. (Reporting by Pravin Char; editing by Ken Ferris)