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Reddick topped the first 20-minute session – and the overall speed chart – with an average lap speed of 93.663 mph.
“It felt really good, honestly,” said Byron. “It was similar to what we expected coming in. I feel good about it.”
Among those drivers who ran at least 10 consecutive laps, Reddick has the fastest average speed (92.318 mph), followed by Byron and Harvick.
Byron topped the second 20-minute session with an average lap speed of 92.846 mph.
Reddick led the way in an incident-free first 20 minute session with an average lap speed of 93.663 mph.
Chastain ended up second-fastest (92.837 mph) and Buescher was third (92.614 mph). Kevin Harvick and Daniel Suarez rounded out the top-five.
Elliott suffered a fractured tibia in his left leg in a snowboarding accident and missed the last six races. He was cleared to compete earlier this week.