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Larson fastest in first day of Vegas testing

William Byron of Hendrick Motorsports and Kyle Larson of Chip Ganassi Racing led the morning and afternoon sessions, respectively, during open testing Wednesday at Las Vegas Motor Speedway.

Byron's top speed of 188.298 mph was good enough to beat out Ryan Newman, who was second at 188.186 mph for Richard Childress Racing. Stewart-Haas Racing's Kurt Busch, Larson and Joe Gibbs Racing's Erik Jones rounded out the top five during the morning session. Full results are at the bottom of this story.

In the afternoon session, Larson led with a top speed of 188.403 mph, which held up as the top speed of the day. Newman again finished second (187.162 mph) with Byron, Kurt Busch and Jones rounding out the top five. Sixteen drivers tested Wednesday on the 1.5-mile track, site of the third Monster Energy NASCAR Cup Series race of the 2018 season and the NASCAR Playoff opener in September.

The test concludes [Thursday] after another round of practices.

--- NASCAR.com