Roger Federer withdraws from Qatar Open with back injury . Roger Federer pulled out of his defense of the Qatar Open Friday with a back injury before his arch-rival Rafael Nadal was beaten in the semifinals of the $ 1 million tournament by Gael Monfils . Two - time defending champion was due to play Jo - Wilfried Tsonga in the last four . Top seed Rafael Nadal lost in straight sets to Denmark 's Gael Beck in second semifinal . Andy Murray sweeps into final of Brisbane International .
Roger Federer withdraws from Qatar Open with back injury . Two - time defending champion was due to play Jo - Wilfried Tsonga in the last four . Top seed Rafael Nadal lost in straight sets to Denmark 's Gael Beck in second semifinal . Andy Murray sweeps into final of Brisbane International .