John Isner fires 26 aces to beat Yoshihito Nishioka at Memphis Open

District of Columbia: US second seed John Isner blasted 26 aces Wednesday in rallying to defeat Japan`s Yoshihito Nishioka 4-6, 6-3, 6-4 and advance to the ATP Memphis Open quarter-finals.

Isner took one hour and 49 minutes to book a Friday last-eight date with compatriot Donald Young, who advanced with a 7-6 (7/3), 6-3 triumph over American teen Reilly Opelka in the indoor hardcourt event.

Bosnian Damir Dzumhur upset Belgian seventh seed Steve Darcis 7-6 (7/2), 6-4 in another second-round match. He will face American Ryan Harrison -- who eliminated US third seed Sam Querrey 6-3, 6-1 -- in another Friday quarter-final.

In first-round matchups, Georgia`s Nikoloz Basilashvili downed Australia`s Jordan Thompson 6-3, 6-0, and Kazakhstan`s Mikhail Kukushkin ousted German lucky loser Benjamin Becker 6-3, 6-4.

Kukushkin will next face Barbados qualifier Darian King while Basilashvili meets Croatian top seed Ivo Karlovic on Thursday.