Czech Tomas Berdych rallied to defeat Frenchman Gilles Simon 6-7 (5-7), 6-2, 7-5 on Saturday at the Thailand Open and will square off in the final against Canada's Milos Raonic, a 3-6, 7-5, 6-4 winner over France's Richard Gasquet in the other semifinal.
Berdych threw down 20 aces during the nearly three-hour match at this indoor event played at the Impact Arena in Bangkok, ending a string of three straight losses to Simon on hard courts.
The Czech rallied to hold serve from 0-40 down in the final game of the match. On Simon's third break point, Berdych hit a ball that looked out by a wide margin but the linesman called it in and the umpire did not overrule.
Simon had used up all of his challenges and, therefore, could not have the call reviewed by instant replay.
Berdych, the world No. 6, will seek his first title of the season against the big-serving Raonic, who blasted 23 aces in defeating Gasquet in just under two hours.
Gasquet was the defending champion, having defeated Simon 6-2, 6-1 in last year's Bangkok final.
In their only previous meeting on the ATP Tour, Raonic defeated Berdych 6-4, 2-6, 6-2 at the 2012 Cincinnati Masters event.
Raonic, who hired Croatian former world No. 3 Ivan Ljubicic as his coach earlier this year, will be seeking his second title of the 2013 season.
Berdych and Raonic have struck 51 and 63 aces, respectively, this week and figure to significantly add to their totals in Sunday's championship match.
The Thailand Open is part of the ATP Tour's post-U.S. Open Far East swing, which also includes events in Malaysia, China and Japan.