If I am watching my favourite team play in a league via that league's paid broadcast subscription, some of those fees end usually end up with the teams via revenue share. Fair chop.

Tennis players are individuals who rarely have leverage/management in place to negotiate for bigger slices of the pie. You only get paid if you win. The base rate for the Australian Open is about 20k USD, which if you are an international travelling, would barely cover costs if you had multiple support staff you had to support on the road for the two weeks the tournament runs