Abreu, who stands 4 feet, 4 inches, has proven he can wheel a stock car. He got on NASCAR's radar by winning the 2015 Chili Bowl, and he then went on to win the first stock car race he'd ever run in the K&N East Pro Series. He also made his debut in the Camping World Truck Series in November 2015.
NASCAR via Getty ImagesRainier Ehrhardt
9. William Byron
Byron won four times en route to becoming the 2015 K&N Pro Series East championship. He just turned 18 on Nov. 29, 2015 and has a full-time Camping World Truck Series ride lined up with Kyle Busch Motorsports for 2016.
NASCAR via Getty ImagesTodd Warshaw
8. John Hunter Nemechek
The 18-year-old son of veteran NASCAR driver Joe Nemechek scored his first Camping World Truck Series victory at Chicagoland Speedway in September of 2015. He hopes to run a full-time CWTS schedule in 2016.
Getty ImagesJonathan Ferrey
7. Tyler Reddick
At age 19, Reddick finished second in the Truck Series points standings in 2015, registering two wins, 14 top-five and 19 top-10 finishes in 19 starts. He'll be back to run a full-time CWTS slate in 2016 for Brad Keselowski Racing.
Getty ImagesSean Gardner
6. Cole Custer
Custer will turn 18 on Jan. 23, 2016, just in time to be old enough to run a full-time CWTS schedule for JR Motorsports. The son of Joe Custer, who is executive vice president of Stewart-Haas Racing, Custer became the youngest winner in K&N Pro Series East history at age 15 in 2013 and the following September became the youngest winner in Truck Series history at New Hampshire at 16 years, seven months and 28 days.
Getty ImagesTodd Warshaw
5. Darrell Wallace Jr.
Despite having already run two full-time Truck Series seasons, during which he won a total of five races, and one full XFINITY Series, Wallace Jr. is only 22. He finished seventh in the XFINITY points in 2015 while driving for Roush Fenway Racing.
NASCAR via Getty ImagesJeff Zelevansky
4. Chris Buescher
Buescher, 23, won the XFINITY Series championship in 2015 on the strength of two wins, 11 top-five and 20 top-10 finishes in 33 starts. He'll move up to a full-time ride in the Sprint Cup Series in 2016, driving for Front Row Motorsports.
NASCAR via Getty ImagesJared C. Tilton
3. Ryan Blaney
Blaney owns four wins apiece in the XFINITY Series and Truck Series. He'll turn 22 this New Year's Eve and will step into a full-time Sprint Cup ride for Wood Brothers Racing in 2016.
NASCAR via Getty ImagesChris Graythen
2. Chase Elliott
The 2014 XFINITY Series champion is stepping up to Sprint Cup in 2016, when he'll drive the iconic No. 24 Chevrolet for Hendrick Motorsports that was recently vacated by the retiring Jeff Gordon. He turned 20 years old in November 2015 and won a total of four times in XFINITY and once in the CWTS over the previous three years.
Getty ImagesJeff Curry
1. Erik Jones
The 2015 Camping World Truck Series champion has been fast in everything he's slipped into over the last two years, totaling seven CWTS wins and two wins, three poles, 13 top-five and 20 top-10 finishes in just 26 XFINITY starts. He'll run a full XFINITY schedule and part-time Sprint Cup schedule in 2016 for Joe Gibbs Racing, but should be full time in Cup by 2017.