The PGA Championship is less than 24 hours away and storylines are aplenty. Sadly, not all 156 entrants will be able to participate in the 107th PGA Championship at Quail Hollow, though.Sahith Theegala will no longer compete in this year's PGA Championship at Quail Hollow.The PGA Tour Communications team posted that he withdrew with a neck injury. Alex Smalley will replace him.This injury is the same one that forced him to withdraw on Sunday at the Truist Championship in Philadelphia last week.Theegala opened with a 69 and 71 at Philadelphia Cricket Club before he vaulted down the leaderboard on Saturday with an 8-over 78. It was not a good day for the No. 31 player in the world as he opened with a birdie and recorded four bogeys, a double and triple bogey before he ultimately chose to withdraw.It has been an up-and-down season for Theegala.The 27-year-old has only missed one cut this year in 14 starts. However, he only has two top 25 finishes.His best tournament this year was the Genesis Invitational, when he finished T17. At the Zurich Classic of New Orleans, he and his partner, Aaron Rai, were T18.Theegala also recorded a T29 at The Masters, marking his third-best tournament of the year.While he has only missed one cut, the Pepperdine golfer has not been good from tee to green. Theegala ranks 149th in strokes gained tee to green, 134th in strokes gained off the tee and 149th in approach to the green.His best strokes gained statistic is on the greens as he ranks 96th on Tour.Whatever is going on has caused him to go from one of the top 50 guys in most stat categories to one of the worst in less than a year.Theegala is not the only guy to withdraw this week with an injury. Billy Horschel did because he will have to have hip surgery. Now the PGA Championship has 98 of the top 100 in the field.More Golf: Justin Thomas Unveils 'Scar Tissue' Impact over Years on PGA Tour