Posted: Fri February 14, 2014 4:20PM; Updated: Sat February 15, 2014 2:03AM

Russell upsets Hewitt, to face Nishikori in Memphis semifinals

Decrease font Decrease font
Enlarge font Enlarge font

MEMPHIS, Tenn. (AP) - Ivo Karlovic of Croatia used his powerful serve in beating American Jack Sock 7-6 (4), 6-7 (3), 6-3 on Friday night in the quarterfinals of the U.S. National Indoor Tennis Championships.

Karlovic, with five career titles, served up 16 aces in knocking the 21-year-old Sock out of his second quarterfinal this year. Karlovic needed 2 hours, 25 minutes, and he finally got the edge in the match by breaking Sock to go up 2-1 in the third. Karlovic converted only one break point after failing on his first 10 chances.

He will play fourth-seeded Lu Yen-Hsun of Taiwan on Saturday. Lu beat American qualifier Alex Kuznetsov 6-1, 6-4 earlier Friday.

Michael Russell upset third-seeded Lleyton Hewitt of Australia 6-3, 7-6 (6) to reach his third career ATP Tour semifinal. Russell will play defending champion Kei Nishikori, a 3-6, 6-3, 6-2 winner over Russia's Alex Bogomolov Jr

Copyright 2014 Associated Press. All rights reserved. This material may not be published, broadcast, rewritten, or redistributed.

SI Videos
Videos from the Web
 
SI.com
Hot Topics: NBA Draft Yasiel Puig NHL Playoffs NBA Playoffs Mark Cuban Jabari Parker
TM & © 2014 Time Inc. A Time Warner Company. All Rights Reserved. Terms under which this service is provided to you. Read our privacy guidelines and ad choices.
SI CoverRead All ArticlesBuy Cover Reprint