Early career and dirt racing

Abreu first began racing dirt bikes,^[1] but after watching an Outlaw kart race in Vallejo, California,^[2] started to race shifter karts.^[1] When he turned 15, he was given his first Outlaw kart.^[2] To support his career, his father built a 1⁄8th-mile asphalt oval in his backyard. On January 24, 2009, Abreu made his Outlaw kart debut at Lakeport Indoor Speedway, finishing fourth, and scored his first Outlaw win at Cycleland Speedway. During the year, local driver Kyle Larson met Abreu at a charity karting event held at Abreu's backyard oval and, in 2011, introduced him to sprint cars.^[1] During the year, he made his Chili Bowl Nationals debut, along with running his first World of Outlaws sprint car race. He would eventually win the 2011 360 Winged Sprint Car Series Rookie of the Year Award. In 2012, Abreu raced in the USAC National Midget Series, clinching Rookie of the Year, while qualifying for the A-main at the Chili Bowl. The next year, he won his first USAC National Midget race at Angell Park Speedway.^[3] Also in 2013, he won the Belleville Midget Nationals, the Johnny Key Classic at Ocean Speedway, the 4 Crown Nationals at Eldora Speedway and the USAC Gold Crown at Tri City Speedway. In 2014, he won his first WoO race at the Thunderbowl Raceway^[2] and later won the USAC Honda Midget Series national title.^[4]

On January 17, 2015, Abreu returned to the Chili Bowl. On lap 26 he passed the previous year's winner Bryan Clauson and held off four-time Chili Bowl winner Kevin Swindell to win.^[5] The win was Toyota's first Chili Bowl victory^[6] and the first for owner Keith Kunz since 2002.^[7] The following year, Abreu repeated his Chili Bowl win after defeating Clauson and Zach Daum.^[8]

K&N Pro Series East

On January 20, 2015, Abreu was hired by HScott Motorsports to run full-time in the K&N Pro Series East. He made his stock car debut in the Pete Orr Memorial Super Late Model 100 at New Smyrna Speedway later in the week.^[1] On July 4, 2015, Abreu won his first ever race in the K&N Pro Series East at Columbus Motor Speedway after starting from the pole position, setting a new track record.^[9][10]

Camping World Truck Series

During the 2015 season, Abreu made his Camping World Truck Series debut in the Lucas Oil 150 at Phoenix International Raceway, driving the No. 31 Chevrolet Silverado for NTS Motorsports.^[11] In 2016, he signed a full-time drive for ThorSport Racing, replacing Johnny Sauter who left for GMS Racing.^[12]

Abreu almost won his first career NCWTS race at Texas on June 10. He was within a car length of race leader William Byron with 2 laps to go, but scraped the wall and ended up cutting a tire, all but riding the wall for the last lap and a half. He still ended up finishing a career-best 9th place.

On January 11, 2017, it was reported that Abreu would not return to ThorSport Racing due to sponsorship issues.^[13] However, he returned to the team for a one-off at Eldora.^[14][15]

NASCAR

(key) (Bold – Pole position awarded by qualifying time. Italics – Pole position earned by points standings or practice time. * – Most laps led.)