Why are there no openly gay male pro tennis players?

America's Brian Vahaly came out after the end of his career. There has not been an active openly gay male player in the Open Era (CREDIT: TELEGRAPH)

At first glance, men’s tennis appears a model of diversity. At next week’s Australian Open, the first grand slam of the year, there will be 10 countries and five different continents represented in the world top 10 alone. As Jamie Murray puts…