People often wonder why there are so few upsets at the very highest levels of pro squash. It is considered a major upset when someone outside the top 10 beats one from the top five, and seeing someone outside the top 20 take out one of the top boys happens only once or twice a year. Contrast this with tennis, where it is not uncommon to have several of the top 10 crash out early in a tournament. Even the dominant trio of Djokovic, Nadal and Federer fall victim to up and comers barely inside the top 30 from time to time. In my opinion, there are a few different explanations for this difference in dramatic upsets.