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Tweet shows just how far William Byron has come

RELATED: Byron to drive No. 5 for Hendrick William Byron's rapid rise to Hendrick Motorsports and NASCAR's top level came from humble beginnings. Monster Energy NASCAR Cup Series driver Landon Cassill, a former Hendrick developmental driver himself, offered visual proof of that with a tweet that documented Byron's commitment to getting better on iRacing six years ago. Byron, 19, will drive the No. 5 in the Monster Energy Series beginning next season. He's spent one full year in the NASCAR Camping World Truck Series (seven wins) and is in his first full-time XFINITY Series season (three wins so far). MORE: Key Silly Season players | All of Byron's wins He got a late start in racing, though, and honed his skills as a teenager through hours of simulation on iRacing. We're not sure how or why Landon decided to save the below message, but we certainly are glad he did. [gallery_content baseUrl="https://www.nascar.com" galleryID="1326" photocount="3"]