DOHA - Czech teenager Jakub Mensik stunned top seed Andrey Rublev in straight sets at the Qatar Open on Feb 22 to reach his maiden ATP semi-final and guarantee a spot in the world’s top 100 for the first time.

The 18-year-old came through 6-4, 7-6 (8/6) against the fifth-ranked Rublev, a day after defeating three-time Grand Slam title winner Andy Murray.