LONDON — Philipp Kohlschreiber must be sick of the sight of Roger Federer after the Swiss maintained his perfect record against the German with an 11th straight victory to reach the Basel International quarter-finals on Thursday.
The world number three and 17-times grand slam champion was made to work hard before battling through to the last eight with a 6-4 4-6 6-4 win.
Federer, who has reached the final in Basel every year since 2006, will next face Belgium's David Goffin, who he beat to clinch the title in Switzerland last year.
The 34-year-old top seed claimed the first set after breaking in the fifth game, but dumped a backhand into the net when serving to stay in the second at 4-5.