ATLANTA, July 26 (UPI) -- John Isner produced 21 aces Friday while defeating James Blake in the quarterfinals of the BB&T Atlanta Open.
Isner, the No. 1 seed who reached the finals of this event in 2010 and 2011, outlasted Blake 7-6 (7-1), 7-6 (7-5) and will face former world No. 1 Lleyton Hewitt in the semifinals.
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Hewitt rallied past No. 3 seed Ivan Dodig 1-6, 6-3, 6-0.
In Saturday's other semifinal, second-seeded Kevin Anderson will take on Ryan Harrison.
Anderson battled past Denis Istomin 6-3, 3-6, 6-3 and Harrison outdueled Santiago Giraldo 6-3, 3-6, 7-6 (7-2).
