Editor's note: This is part of a series from NASCAR.com reviewing the top 30 drivers in the NASCAR Cup Series in reverse order of the 2025 final standings
- Driver: William Byron, No. 24 Hendrick Motorsports Chevrolet
- Crew chief: Rudy Fugle
- Final 2025 ranking: 4th
- Key stats: 3 wins, 11 top fives, 16 top 10s, 1,330 laps led
- How 2025 ended: William Byron's evolution behind the wheel of the No. 24 Chevrolet led him back to the Championship 4 for the third consecutive season after his fourth straight multi-win campaign.
- Best race: Indeed, the year's penultimate race at Martinsville Speedway produced an absolute masterclass by Byron, Fugle and the No. 24 Hendrick Motorsports team. Entering NASCAR's final race of the semifinal round beneath the provisional cutline, Byron won the pole, swept the stages and led a career-high 304 of 500 laps en route to winning his way into the Championship 4. Byron muscled past Ryan Blaney with 44 laps remaining to reclaim the lead for the final time, ousting Blaney from Champ 4 contention and propelling Byron to Phoenix.
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- Other season highlights: Byron began the season by winning the 2025 Daytona 500, becoming just the fifth driver to win the "Great American Race" in consecutive years. In addition to an impressive win at Iowa Speedway in which he led 141 of 350 laps, Byron also had dominant performances equate to runner-up finishes at Darlington Raceway in the spring and the Coca-Cola 600 at Charlotte Motor Speedway. The No. 24 Chevrolet led the first 243 laps of the Goodyear 400 at Darlington but ultimately could not reclaim the lead late. At Charlotte, a fierce battle between Byron, Denny Hamlin and Ross Chastain resulted in a Chastain victory despite Byron leading 283 of 400 laps that evening. The No. 24 team showed notable resolve throughout the season's opening 26 races, overcoming stretches of adversity and inconsistency all the way to clinch the Regular Season Championship one week early.
- Stat to know: Byron ended his campaign with a series-best 1,330 laps led -- bettering his previous high mark (1,016 led in 2023) by over 300 laps. The No. 24 Chevrolet was out front more than any other driver this season, leading 224 more circuits than 2025 champion Kyle Larson, Byron's teammate, who led the second-most laps this year with 1,106 laps out front.
- Quotable: "Winning the regular season championship and winning the (DAYTONA) 500 (and) three races a year is something to really be proud of. So yeah, I feel like it was our best year yet, honestly, but it was a lot of adversity and a lot of things that happened all the way to the end. I mean, it seems like a lot changed for us in the results column with about three laps to go this year. We've just got to learn from that - and a lot of it was kind of out of our control. But yeah, just gotta move past it. But I think overall, yeah, it was our best year."
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- Looking ahead: Few drivers have maintained a consistent year-over-year level of performance, as Byron has in recent seasons. That level of production and sustained championship contention should remain prominent for him and the No. 24 team entering the 2026 campaign. There is some history on the line in February as he attempts to become the first driver to win three straight DAYTONA 500s. But the biggest question remains: Will 2026 will be the year Byron breaks through for his first NASCAR Cup Series championship? There are very few reasons to think he won't.