The AT&T Byron Nelson Championship lost one of the biggest stars from its field when Jason Day withdrew Wednesday morning.
Day notched his first PGA Tour victory at TPC Four Seasons back in 2010, and his record at this event included a fifth-place finish in 2011 and a T-9 result in 2012. At No. 8 in the OWGR, Day was the second-highest ranked player in the 156-man field behind only world No. 2 Jordan Spieth.
While no reason was originally offered when the Tour announced Day's withdrawal, multiple onlookers noted that the Aussie played five holes of his pro-am round before walking off the course. Bill Nichols of the Dallas Morning-News then tweeted that Day withdrew because of "severe dizziness":
.Jason Day's WD from AT&T Byron Nelson caused by "severe dizziness" during Wednesday pro-am— Bill Nichols (@BillNicholsDMN) May 27, 2015
Day offered the same reason when he withdrew from the WGC-Bridgestone Invitational in August. He returned to action the following week and finished T-15 at the PGA Championship.
A winner earlier this season in San Diego, Day has not played since shooting an 81 in the second round of The Players Championship. He has a home in Columbus, Ohio and is still listed among the early commitments for the Memorial Tournament next week.
Day was replaced in the field in Dallas by Tim Petrovic.