How many times has Łukasz Kubot reached the quarterfinals of a Grand Slam in singles?
Once
Twice
Thrice
Four times
Answer
Łukasz Kubot reached the quarterfinals of a Grand Slam in singles once, at the 2014 Wimbledon Championships. He defeated David Ferrer, Juan Martín del Potro, and Rafael Nadal to reach the quarterfinals, where he lost to Novak Djokovic.