Bucharest, Romania (SportsNetwork.com) - Top-seeded world No. 16 Grigor Dimitrov was an easy quarterfinal winner, while a battle of the last two Bucharest champions saw reigning titlist Lukas Rosol outduel three-time winner Gilles Simon in order to reach the semifinals at the $590,000 BRD Nastase Tiriac Trophy tennis event.
The rising Bulgarian star and recent Acapulco champion Dimitrov erased Ukrainian Sergiy Stakhovsky 6-3, 6-4 to set-up a semifinal showdown with third-seeded former top-10 Frenchman Gael Monfils, who snuck into the final four with a 3-6, 7-6 (10-8), 6-2 victory over qualifier and fellow countryman Paul-Henri Mathieu. Monfils trailed 0-5 in the second-set tiebreak before mounting an outstanding comeback on Day 5.
Meanwhile, the unseeded big-serving Czech Rosol upended the fourth-seeded Frenchman Simon in straight-set fashion, 7-6 (7-2), 6-2, to win his eighth straight match on the red clay at BNR Arenas.
Simon is now 18-3 lifetime in Bucharest, where here titled back-to-back in 2007 and 2008 and again in 2012.
The 6-foot-5 Rosol topped Spaniard Guillermo Garcia-Lopez in last year's Bucharest finale to capture his lone career ATP title.
Rosol's semifinal opponent on Saturday will be Dutchman Robin Haase, who came from behind to dismiss Uzbekistan's Denis Istomin, 3-6, 6-1, 6-3.
This week's winner will collect $106,725.