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Philipp Kohlschreiber awaits Roger Federer in Rotterdam round two amid world No. 1 chase

Kohlschreiber battled hard (Picture: Soccrates/Getty)

Philipp Kohlschreiber awaits Roger Federer in the second round in Rotterdam after the German battled past Karen Khachanov in a tight encounter.

The 34-year-old edged the Russian 3-6 7-6 (7-1) 7-6 to advance, and he may have a shot of denying Federer a piece of history, should the 36-year-old Swiss progress past his first-round opponent.

Federer can replace Rafael Nadal at the top of the rankings and Andre Agassi as the oldest male world No. 1 in history with a run to the semi-finals.