Andy Murray says he struggled with confidence after high-profile defeats . Four grand slam finals , four heartbreaking defeats . The world number one has been forced to withdraw from the US Open and Wimbledon due to a back injury but is set for his first match since returning on Thursday. He won Olympic gold and U.S. Open crown in quick succession . Coach Ivan Lendl is credited with improving his fortunes this year .
Andy Murray says he struggled with confidence after high-profile defeats . The world number one has been forced to withdraw from the US Open and Wimbledon due to a back injury but is set for his first match since returning on Thursday. He won Olympic gold and U.S. Open crown in quick succession . Coach Ivan Lendl is credited with improving his fortunes this year .