Top-seeded Del Potro used his dominating serve to beat Mathieu of France 6-4, 6-4 in the Swiss Indoors quarter-finals.
Basel: 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 quarter-finals on Friday.
Del Potro had 11 aces and never faced a break point against the 101st-ranked Mathieu.
In Saturday's semi-finals, 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 quarter-final against eighth-seeded Grigor Dimitrov of Bulgaria.
The winner plays Vasek Pospisil of Canada in the semi-finals. Pospisil beat Ivan Dodig of Croatia 7-6 (11), 6-4.
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