Jeffrey John "J. J." Wolf (born December 21, 1998) is an American professional tennis player. He reached a career-high singles ranking of120 in September 2020. Wolf played collegiately at The Ohio State University, where he was the #1 ranked player in college tennis. J. J. sat with Karl Corbett of Tennis Acumen at the Knoxville Challenger in November, 2019. Here is part of that exclusive interview.

Karl: What sort of goals and dreams do you have, J. J.?
J.J.: I want to reach my ceiling. The main thing for me? I don't have a. specific numerical goal in mind. I just want to see how good I can get. You know I'm not quite sure what that is, but I'm hoping it's high.
Karl: John Millman is a friend. I asked him: “How do you know when you're done with tennis?” He said: “When I'm not getting any better.” That's exactly what you're saying. It’s when you reach that ceiling.
J.J.: And I remember my grandpa told me something huge. He's 93 now. Maybe three or four years ago, I asked him: “Is your body deteriorating, anything like that?” He said: “I used to think about it like that.” He'd do his leg lifts and all his workouts every day. And I asked: “Will you know when you start not being able to do your reps (repetitions of an exercise)?” He said: “I'm not thinking about it like that .I'm still increasing my reps.” So, I'm thinking, the harder you can go…. If he's not slowing down his 90’s, I'm not going to slow down in my late 30s, so I and not worried about the end coming too soon.
Karl: So, you'd mentioned Federer. Any other heroes growing up or people whose style you emulate?
J.J.: I try to emulate a right-handed version of my dad, when he played. I always liked the American guys. Andy Roddick, I’m a big fan of his. Guys like John Isner, Sam Querrey, obviously taller than me, but I like watching them a lot. Andre Agassi...... I always liked how he returned and how he moved. Andre’s style is funny sometimes. I had a mullet earlier in the year that looked like his a little bit. Not as long, but... I kind of did that for the boys at Ohio State.
Karl: That’s brilliant, really. Tell me, when you're on the road, who do you keep in touch wit, and how?.
J.J.: I've got a lot of great childhood friends and college friends besides my family. I've got a couple buddies that I lived with last year. They go to Ohio State. One plays football and one is very smart and driven, works a lot. Both of them are very good about keeping in touch. We will do FaceTime, just talk and kind of keep up. Makes me feel like I'm at home a little bit. Those two, in particular keep, me grounded.
Karl: It’s good to have friends. I love that. Hey, great interview, J.J. sure we will be seeing you in Cincinnati. That's my home base.
J.J.: I hope so
Karl: Now, as the interviewer always says, good luck in the next round, J.J.
J.J.: I appreciate it. Thank you.