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Lu Yen-hsun

Federer through to Halle semis without hitting a ball

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. Fourth seed Kei Nishikori of Japan beat American Steve Johnson 6-1 7-6 (4) and Colombian Alejandro Falla ousted home player Peter Gojowczyk 7-6 (4) 7-6 (2). Seventeen-times grand slam champion Federer…