Big server John Isner defeated Cypriot Marcos Baghdatis from 6-7(5), 6-4, 6-4 to enter the semifinals of Citi Open.
The 20th-ranked Isner powered 49 aces in the match. Isner will face Russia's Dmitry Tursunov in the semis, reports Xinhua.
"I'm in a good rhythm and I'm serving well," Isner said Friday.
