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Fifth seeded Denis Istomin of Uzbekistan arrowed 10 aces in the middle to down Frenchman Paul-Henri Mathieu with a 7-5, 6-1 scoreline in the opening round of Estoril Open, Portugal.
Also, sixth-seeded Robin Haase of Netherlands fired four aces to get past Italian Simone Bolelli of Italy 6-3, 6-2.
Another Italian Paolo Lorenzi survived five of seven break points against Edouard Roger-Vasselin of France to emerge victorious with a 3-6, 7-6(2), 6-4 scoreline.