(Reuters) - Steve Johnson pulled off another upset over one of the circuit's big men at the Citi Open in Washington on Thursday, ousting towering ninth seed Ivo Karlovic 3-6 7-6 7-6, while top-seeded Czech Tomas Berdych was also eliminated in the third round.
Johnson, who disposed of lofty fellow American and fifth seed John Isner on Wednesday, saved two match points against the 6ft-11in (2.11m) Karlovic and withstood a barrage of 27 aces to seal victory over the Croat in a third-set tie-breaker.
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