Martin Lee Truex Jr. (born June 29, 1980) is an American semi-retired professional stock car racing driver.

Truex Jr. would make his move to the Modified division at Wall Stadium in 1998, as soon as he was old enough to race a car at the age of 18 (under New Jersey regulations).

He made his debut with Chance 2 at Richmond International Raceway, where he qualified sixth and led 11 laps before transmission failure forced him to a 31st-place finish.

He split time between Chance 2 and his late father's team for the balance of the season, except at Dover, where he drove for Stanton Barrett.

While on his way to that championship, Truex made an appearance in the Nextel Cup Series as a relief driver to Dale Earnhardt Jr., who had suffered burns in a sports car accident.

He won the first Busch Series points race held outside the United States, in Mexico, as well as defending his wins at Talladega and Dover International Speedway.

A few weeks later, he won the Autism Speaks 400, scoring his first Sprint Cup Series win with an interval of seven seconds between pole-sitter Ryan Newman and himself, even though he led over half of the race—216 of the 400 laps.

The following week at Kansas he started 6th and flat-out dominated the race, leading 173 of 267 laps but falling short to Denny Hamlin.

At Atlanta, he led 40 of the final 46 laps, but ultimately fell short to Hamlin again when he was forced to pit under a late-race caution for fuel, ending up fourth.

He led late but after a late-race red flag period erased his 5-second lead on Joey Logano, Truex lost his rhythm and finished second to Matt Kenseth.

At Kansas, Truex led the most laps (95), but a late caution killed his chances as he slipped back to 9th on the last restart, and he was unable to make up enough ground to catch Jimmie Johnson.

At Dover, Truex led the most laps again (131 of 405), but a poor restart caused him to slide back to 7th and cost him the race to Johnson.

With 19 laps to go Harvick and Larson found themselves five seconds behind the leader when a caution came out for a hard wreck by Aric Almirola in the No.

Truex seemed to have optimal timing again near the finish, springing to the lead shortly after the final exchange of pit stops in the closing 102-lap run of green-flag racing.

With three laps to go, Truex's tire gave way, allowing Hamlin to scoot by and grab his second win of the season.

Truex, though clinching the regular-season championship, expressed discontent with the 1990 Daytona 500 champion, Derrike Cope who caused a caution that changed the outcome of the race, leading up to the wreck.

He later earned himself a 5th-place finish at New Hampshire Motor Speedway, although being involved in an eight-car pileup with minor damage midway through the race.

For the next few weeks, Truex picked up Top 5 finishes for the next five straight races, including two poles, and a win at California.

However, the race and championship hope unraveled due to a miscue during the pit stop, in which the left and right front tires were switched around, and installed to the incorrect sides.

He recovered and began to rally back through the field, but could not overcome the loss of track position, ultimately finishing 2nd in the race to teammate Kyle Busch and the final championship standings for the second season in a row.

[30] Truex was also the first driver to lead the series in wins after switching to a new team since Matt Kenseth in 2013, who also did it with Joe Gibbs Racing.

[31] On December 9, after serving as Truex's crew chief for six seasons, Pearn announced he has parted ways with JGR to pursue opportunities outside the sport.

[32] At Martinsville in June, Truex controlled the final 100 laps and won his only race of the season after early-race damage to the front of his car prevented the right-front tire and brake pads from overheating.

In the final round of the playoffs at Texas Motor Speedway, Truex got loose in turns 3 and 4, snapping the car around and causing him to slam into the outside wall.

Truex tried his best to overtake the top contender, Kyle Larson, as the laps kept winding down, but ultimately finished 2nd in points after coming up just short of winning.

In June, Truex expressed uncertainty about his future in the NASCAR Cup Series with him debating over if he would retire or stay with JGR.

[46] On the second playoff race at Kansas, Truex experienced a puncture on his right rear tire and crashed on the third lap, finishing in last place and dropping him below the cutoff line.

[47] However, the following week at Bristol, he was able to salvage a bad night and finish 19th two laps down, going above the cutoff line by five points after Joey Logano and Kevin Harvick had issues late in the race.

56 Toyota Camry, driven by Truex, with Bass Pro Shops as the primary sponsor and Cole Pearn serving as the crew chief.

His younger brother, Ryan, is a former champion in the K&N Pro Series East, and was a contender for 2014 Rookie of the Year in Sprint Cup.