Wimbledon 2014: Five young men who could breach the fortress of the big four

#4 Jack Sock; Rank 77; Age 21

Jack Sock is widely considered by tennis experts such as Brad Gilbert and John McEnroe as the next big American hope. Sock packs a mean forehand to accompany him on his journey to stardom. The young man has an imposing presence around the court having gained confidence from rising nearly 100 places from his ranking of 168, in February 2013.

Sock has made the second round of the Australian Open this year, where he suffered a tough loss to Gael Monfils. He caught the attention of the tennis world again at the French Open, where he succumbed to an inspired Dusan Lajovic, another young and upcoming star from Serbia.

Though Sock lists clay and hard courts as his favourite surfaces, there is no doubt that he has the game to cause a few upsets on the green grass of Wimbledon. The draw may have been kinder, but he will take his chances against Frenchman Pierre-Hugues Herbert. If he gets through that first round, he will probably have the big serving Milos Raonic across the net to play out a promising second round encounter.