4. Jerzy Janowicz
World number 14, Jerzy Janowicz, became half the nation's enemy when he was drawn to face Andy Murray in the Wimbledon semi-finals and that was more through fear of him than wrongdoing by him. The 6 foot 8 inch giant is a colossus on the court, and with one of the most powerful serves he is an incredibly exciting player to watch. Despite being prone to a high number of double faults, Janowicz' height means he has a high trajectory from the serve, making it difficult to defend against, especially when he's hitting serves of 143 mph like he did whilst hitting 103 aces at this year's Wimbledon Championships.