Johnson tops Harrison at Citi Open as Karlovic upsets Tomic

With an appearance at the Rio Olympics looming, Steve Johnson bounced fellow American Ryan Harrison in the Citi Open. Ivo Karlovic upset Bernard Tomic as well.

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WASHINGTON (AP) — Fifth-seeded Steve Johnson ended qualifier Ryan Harrison’s season-best run in the Citi Open’s third round, winning the all-American matchup 6–4, 6–4 on Thursday.

Johnson, a member of the U.S. Olympic team headed to Rio de Janeiro next month, broke Harrison once in each set, did not face a break point himself and ended the match with a 130 mph ace.

In the quarterfinals of the hard-court tournament, Johnson will face top-seeded John Isner or No. 15 Marcos Baghdatis. Last year, Isner beat Johnson in the Citi Open semifinals.

Also Thursday, No. 13 Ivo Karlovic hit 21 aces and eliminated No. 3 Bernard Tomic 7–6 (4), 6–3.

In women’s action, third-seeded Monica Puig lost to Lauren Davis 6–4, 6–2, while fourth-seeded Kristina Mladenovic beat 2013 Wimbledon runner-up Sabine Lisicki 6–3, 6–3.