By Jack Bantock, CNN (CNN) — It was roughly 7 a.m. on Thursday when Danny Walker, in a restroom of the TPC Sawgrass locker rooms, felt his phone begin to buzz. The call itself lasted a little more than a few minutes, but its impact for the PGA Tour rookie has already been nothing short of life-changing – and could get even better. A last minute withdrawal from former world No. 1 Jason Day saw Walker parachuted into The Players Championship, wher…