Expected. Sergiy brings more to the table and has the type of game to frustrate players like De Bakker. De Bakker is talented but he lacks the firepower of the true top threats who play his game, Berdych, Cilic, Tsonga. But he's still developing, it just will take some time. Stakhovsky played very well and solid and was confident, congrats to him.
Don't think the power is the issue. I mean he will gain more pace over his career regardless. His issue is still the mental part of his game and his consistency. He doesn't know when to pull the trigger and when to hold back as well. But for sure, I don't think it has anything to do with him lacking pace.