Jimmy Walker figured he had the flu.
He arrived in Australia in December 2016, five months removed from a career-defining PGA Championship victory at Baltusrol, feeling achy and fatigued.
A momentary setback, former Baylor standout Walker figured. Turns out he was in the early throes of a mystifying, hard to diagnose and treat malady, Lyme disease.
Walker's scary and agonizing path from initial sickness to fluke diagnoses and a year of treatments to Friday at Trinity Forest Golf Club, where his 11-under score has him in a third-place tie midway through the AT&T Nelson championship, is hard for him to put in perspective.