Justin Marks posted the fastest lap in final practice for the Johnsonville 180 at Road America with a speed of 109.603 mph.
He beat James Davison (109.179 mph) by more than half a second (.517).
Making his return to NASCAR, Hall of Famer Bill Elliott (105.791) posted the 26th fastest time.
Last year’s winner, Jeremy Clements had a left front tire go flat in turn five 20 minutes into final practice and brought out a red flag.
Kaz Grala and Brian Henderson had off-course excursions in Canada Corner.
After driving off course in the rain in practice one, Tyler Reddick spun with Katherine Legge in Turn 5 with 50 minutes remaining in the session. Both drivers returned to the pits under their own power. Reddick had damage on the right front; Legge had damage on the left rear.
Legge (106.524) ended the session 23rd on the chart.
Wet conditions kept most of the competitors off track in the first practice session.
Rookies Reddick and Conor Daly were the only two drivers to take to the track.
Reddick made several laps practicing his entry onto pit road. Only one circuit was completed at speed (152.280).
Midway through the session, Reddick had an off-course excursion.
“Got a little wheel hop in the brakes and as soon as I tried to go down into the next gear, it went into neutral and didn’t catch third,” Reddick said on the NBCSN Sports App. “At that point, just hoping that when I hit the sand pit it wouldn’t do too bad a damage, but unfortunately it tore the splitter up pretty bad. “