Tennis betting is unlike gambling on any other sport due to the fact there is a very large gap between the finest tennis players in the world and the rest. Very seldomly are the likes of Federer and Nadal toppled by players ranked below them and that can help shape a punter’s guide to betting on tennis. The phrase ‘bet the house on it’ you feel was made for match-ups between the likes of world number one Rafa Nadal and world number 50 John Millman. When the competition begins to draw to the business end of the quarterfinals and semifinals,…