Feb 10, 8:08 PM EST

Kukushkin upsets 5th-seeded Denis Kudla in Memphis Open.

Special Section
Complete Tennis Coverage
French Open Preview with Michael Chang
Michael Chang Reminisces 1989 French Open Victory
Hingis' Career in Pictures
Tennis News
Kukushkin upsets 5th-seeded Denis Kudla in Memphis Open.

Thiem, Almagro into quarterfinals in Argentina

2nd-seeded Cilic beats Muller to reach last 8 in Rotterdam

Ivanovic beats Gasparyan to reach St. Petersburg quarters

Williams coasts to 6-3, 6-2 win over Lee at Taiwan Open

Buy AP Photo Reprints

MEMPHIS, Tenn. (AP) -- Kazakhstan's Mikhail Kukushkin upset fifth-seeded Denis Kudla 6-1, 7-5 on Wednesday in the second round of the Memphis Open.

Kukushkin, ranked 93rd in the world, got off to a quick start in the opening set against Kudla, the American who entered the tournament at career-best ranking of 59th. The second set was more competitive, but Kudla was unable to overtake Kukushkin.

Kukushkin will play the winner of the night match between top-seeded Kei Nishikori of Japan and American Ryan Harrison. Nishikori has won the tournament the last three years.

In other second-round matches, fourth-seeded Sam Querrey of the United States beat Henri Laaksonen of Switzerland 6-3, 6-4, and Japan's Yoshihito Nishioka topped Ukraine's Illya Marchenko 6-1, 6-3.

© 2016 The Associated Press. All rights reserved. This material may not be published, broadcast, rewritten or redistributed. Learn more about our Privacy Policy and Terms of Use.