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Del Potro beats Mathieu in Swiss Indoors semis

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Del Potro beats Mathieu in Swiss Indoors semis
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Germany's Daniel Brands serves a ball to France's Edouard Roger-Vasselin during their quarter final match …

BASEL, Switzerland (AP) -- Top-seeded Juan Martin Del Potro of Argentina used his dominating serve to beat Paul-Henri Mathieu of France 6-4, 6-4 in the Swiss Indoors quarterfinals on Friday.

Del Potro had 11 aces and never faced a break point against the 101st-ranked Mathieu.

In Saturday's semifinals, del Potro will play doubles specialist Edouard Roger-Vasselin of France, who beat Daniel Brands of Germany 6-3, 4-6, 6-3.

Roger Federer followed del Potro on court in a quarterfinal against eighth-seeded Grigor Dimitrov of Bulgaria.

The winner plays Vasek Pospisil of Canada in the semifinals. Pospisil beat Ivan Dodig of Croatia 7-6 (11), 6-4.

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