Editor's note: In the midst of the U.S. Men’s Clay Court Championships in Houston this week, World No. 59 Mackenzie McDonald was kind enough to take some time to fill in for Jon Wertheim in this week's Mailbag. The 23-year-old American fielded questions on college tennis, his thoughts on the sport’s GOAT, his favorite Roger Federer story and more.
Have a question or comment for Jon? Email him at jon_wertheim@yahoo.com or tweet him @jon_wertheim. He’ll return to the Mailbag next week.
Curious, Mackie, what have been the biggest changes from when you were training in NorCal/Berkeley, to where you now train?