I recall he was in the on-court stringing room. P1 couldn't string his racket because they were too far, and Andy needed a tension change in the middle of match. They kept showing the stringer on TV, stringing Andy's racket.
I always see a stocky Asian guy in most of the stringing room videos. What's his name?
Machines: Gamma 6004 2-point w/ Wise 2086 & Babolat Sensor Dual