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Phoenix Xfinity practice: Ty Gibbs tops title contenders

Ross Chastain's Martinsville move unintentionally created a great lesson in physics. Dr. Diandra Leslie-Pelecky 'teaches' Dave Burns how Chastain managed to pass five cars during the last half-lap of the race.

Sammy Smith was the fastest, while Ty Gibbs had the best lap among the championship contenders in Friday’s Xfinity Series practice at Phoenix Raceway.

Joe Gibbs Racing drivers took the top three spots in practice, led by Smith (131.128 mph). Brandon Jones, who was wrecked out of the lead by Gibbs last weekend at Martinsville, was second on the speed chart at 130.581 mph and then Gibbs (130.520 mph).

MORE: Phoenix Xfinity practice

Daniel Hemric was fourth on the speed chart at 130.105 mph and Riley Herbst completed the top five at 129.557 mph.

Gibbs was the only championship contender to be in the top 10 in practice. Justin Allgaier was 12th with a lap of 129.408 mph, Noah Gragson was 13th with a lap of 129.371 mph and Josh Berry was 14th with a lap of 129.366 mph.

Gibbs had the best average over 10 consecutive laps at 129.520 mph. Gragson was fifth at 128.616 mph, Allgaier was sixth at 128.579 mph and Berry was ninth at 128.121 mph.

The Xfinity championship race is set to begin at 6 p.m. ET on USA Network.

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