American Sam Querrey stepped up his rivalry with countryman John Isner, blasting 19 aces to reach the quarter-finals of the ATP Winston-Salem Open.
Sam Querrey of the USA returns a shot against Jarkko Nieminen of Finland during the Winston-Salem Open at Wake Forest University in Winston-Salem, North Carolina, on August 21, 2013. Querrey stepped up his rivalry with countryman John Isner, blasting 19 aces and reaching the quarter-finals.
Sixth seed Querrey on Wednesday beat 11th seed Jarkko Nieminen 4-6, 7-6 (7/4), 7-6 (12/10) a day after the 40th-ranked Finn had advanced when American Mardy Fish could not continue due to heat stroke.
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