Andy Murray beat Adrian Mannarino in the BNP Paribas Open fourth round . The world number one was forced to retire after suffering a back injury during his match against the Italian on Thursday.
Andy Murray beat Adrian Mannarino in the BNP Paribas Open fourth round . Murray is now level with Tim Henman on 496 career wins . Afterwards , he said he was keen to break all Henman 's records . The British No 1 next takes on Feliciano Lopez in the quarter-finals .