The Pole admitted that he was disappointed following the 6-7 6-4 6-4 6-3 loss, but remains upbeat about his future prospects.
"I'm a little bit disappointed," Reuters quotes him as saying. "Today I didn't play my best tennis. I think this was second worst match during this tournament. I was struggling a little bit with my serve.
"I'm just hoping one day I'll become top 10 in the world."
The 24th seed became the first Polish man to reach a Grand Slam semi-final after seeing off Lukasz Kubot in the last eight.