Can't find anything to suggest he's been injured, but at 6'10" and probably still growing I can see managing his growing body while he fills out into his early 20's being a real challenge, if he can get into a robust, durable physical state he will be around a long time.

Although I know he gave it some serious thought I am still very suprised that he didn't follow Isner into College tennis for these reasons, particularly somewhere like UCLA, USC, Texas, Cal where they have powerhouse Basketball programs and great experience of managing young men of this stature becoming elite athletes, indeed it is where the experience lies as even the very best High School Baketball players go to College.

For the sake of completeness, though it pains me to report it:

R1:  Paul Oosterbaan & Nathan Ponwith (USA/USA) UNR defeated Gerardo López (MEX) & Cam Norrie UNR (1452+0) by 4 & 4

My scoreboard has that Norrie won the first set (and agrees he is up a break in the second)