In this world of twenty four hour television and satellite communications sports gambling has seen something of a revolution. Not many years ago almost every sport was followed during defined seasons depending on where in the world you lived, but the ardent sports gambling fan can now concentrate on their chosen sport almost all year round from somewhere in the world. Any visit to one of the online sports gambling sites will demonstrate the vast range of sports vying for the attention of the gambling public, including many which have normally been regarded as minor sports from the gambling point of view. Take tennis as an example, not a sport which has a history of major interest from the sports gambling fraternity, but gambling on tennis is now increasingly popular in many parts of the world. Clearly gambling on tennis will never compete with horse racing or football, but its stars are now very high profile and attract a great deal of attention worldwide, particularly during the major tournaments. Any sports gambling fan for instance will probably know that the US Open in New York has reached the finals stage this weekend, and it is a fair bet that many will also know who the finalists are. This is the tournament which provided Andy Murray with his much publicised first major win last year, following his Olympic gold medal and his subsequent victory at Wimbledon. Most tennis gambling enthusiasts will also know that the semi-finals of the major men’s tournaments over recent years have been dominated by the top four players in the world rankings, so this year’s US Open has already defied the form book with the loss of Roger Federer and Murray in the quarter-finals. Any sports gambling enthusiast will know that the form book is an essential tool in successful gambling on any sport, although they will also know that sport always throws up some surprises and the trick is to pick that surprise result. Gambling on tennis has not seen any major success for outsiders in recent years but perhaps that is about to change, albeit in the semi-finals at least.