Reddick was the only driver to break the 187 mph mark in the first practice and turned an average speed of 187.493 mph. Christopher Bell was second with a speed of 186.406 mph. Cole Custer (185.230 mph), Brandon Jones (185.223 mph), and Austin Cindric (185.077 mph) closed out the top 5.
The first practice ended early when Ryan Sieg crashed on the exit of turn 2. With less than five minutes to go, Sieg lost the rear end of this No. 39 Chevrolet and crashed into both the outside and inside retaining walls. Unfortunately for Sieg, he was seventh fastest (184.533 mph).
No drivers turned 10 consecutive laps. Harrison Burton ran the most laps, 24. Bobby Dale Earnhardt (21) and Michael Annett (20) were the other drives to practice 20 or more laps in the first practice.
Chastain turned not only the fastest lap of second practice but the day. His No. 10 Kaulig Racing Chevrolet clocked in at 187.937 mph.
Bell was once again second fastest at 187.201 mph. Reddick finished final practice in third (187.013 mph) and followed by Justin Allgaier (186.117 mph) and Cindric (185.982 mph).
Bell has the best 10 consecutive lap average in second practice. He averaged 184.558 mph, and Custer (184.532 mph) and Allgaier (184.222 mph) followed him.
There were no incidents in the final practice.
The Xfinity Series will qualify tomorrow at 5:35 p.m. ET on CNBC and the NBC Sports App, followed by the race at 8:30 p.m. ET on the NBC Sports Network.