Tennis pros Evan Zhu, Jody Maginley and Justin Roberts have done some research this week and reveal how much different tennis players have earned this year. The results are surprising!With Andy Murray dropping down to play an ATP Challenger Tournament recently, the guys discuss what it's like when they come up against someone a lot higher in the ATP rankings.The Weekly Grind is the podcast to watch to if you want to know exactly what it's like to be a pro tennis player looking to train hard, ...