ESTORIL, Portugal, April 30 (UPI) -- No. 5-seeded Denis Istomin had 10 aces in grabbing a first-round victory Monday at the Estoril Open tennis tournament in Portugal.
Istomin had seven aces in the first set and three in the second of a 7-5, 6-1 win over Paul-Henri Mathieu. Istomin had four breaks and dominated the second half of the match. He took 72 percent, including 16-of-19 serving, of the points in the second set.