Cole Custer posted the fastest single lap in the first practice session for the Sparks Energy 300 with a speed of 194.125 mph.
Custer beat Spencer Gallagher (193.980 mph) by .037 seconds.
Sadler is one of the Dash 4 Cash contenders this week.
Jones had the quickest, 10-lap average of 191.887 mph with Bell (191.416) second.
Only 17 cars competed in final practice with Shane Lee posting the fastest lap of 187.938 mph.
None of the Dash 4 Cash contenders participated in this practice.
No one ran 10 or more laps.
Qualification will take place Saturday at 10:00 a.m.