Trevino, who opened with a 5-over 77, withdrew midway through the back nine of the second round.
After battling back problems for nearly 30 years, Trevino doesn't anticipate playing again until he has surgery in the fall.
'I have two discs that have pressed together and trapped a nerve in my leg, so I don't have any power,' he said. 'I didn't want to ruin the summer by having back surgery, so I scheduled it for the fall. I thought I could play this week, but it just didn't work.'
Trevino finished the round so partner Dana Quigley wouldn't have to continue by himself. Quigley finished with a 5-under 67 and moved to 9 under overall.
'I told Lee to go in, because the pain was so bad, but he stayed out there so that I didn't have to wait for a marker or something,' Quigley said.
Trevino joked with the gallery on the last few holes and didn't worry about following the strict rules of golf.
'The fans don't know when we are hurting or feeling bad - they paid to see a show,' he said. 'I'm sure the tour will be getting letters about why they were letting me pick up my ball in the bunker or take drops in the middle of the fairway, though.'
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