Roger Federer of Switzerland prepares to return the ball to Ernests Gulbis of Latvia during their men's singles match at the French Open tennis tournament at the Roland Garros stadium in Paris June 1, 2014. REUTERS/Gonzalo Fuentes
(Reuters) - Roger Federer reached the semi-finals of the Gerry Weber Open without hitting a ball on Friday after Lu Yen-hsun of Taiwan pulled out because of a back injury in Halle, Germany.
Elsewhere, Rafa Nadal's conqueror Dustin Brown was knocked out after he lost a final set tiebreak 18-16 against fellow German Philipp Kohlschreiber.
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