Verplank played at the TPC-Summerlin course, one of three used for this pro-am tournament, and finished 36 holes at 17-under 126. Flesch reached the same total with a 64 at TPC-Canyons.
Verplank, 39, has finished fourth twice this season and has missed only three cuts in 23 starts. But he has not won in more than two years.
"When you get as old as I am, you get worn out," Verplank said. "Then your attitude gets a little sour. I've tried to rectify that this week."