Hamburg Masters
French teenager Richard Gasquet was a 6-1 6-2 winner over Italian Andreas Seppi.
Gasquet, ranked 56th, could provide the main threat to Federer, whom he beat last month in one of the shock results of the season in the Monte Carlo Masters quarter-finals.
The 18-year-old from Beziers bludgeoned his way past Seppi, the world number 113, in a display of brute force in the centre court's evening game.
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