Martin was released from his part-time schedule at Michael Waltrip Racing on Monday and will drive the No. 14 Chevrolet in 12 of the final 13 Sprint Cup races for Stewart-Haas Racing. Stewart, a three-time Cup champion, will miss the rest of the season while he recovers from the broken right leg suffered in a sprint car crash Aug. 5 at Southern Iowa Speedway.
Nationwide Series driver Austin Dillon will drive the No. 14 on Oct. 20 at Talladega. Dillon filled in for Stewart on Sunday at Michigan and finished 14th.
Martin entered 16 of 23 races as part of a shared ride in the No. 55 with Michael Waltrip at Brian Vickers at MWR. Vickers, who won this season at New Hampshire, will now drive the No. 55 Toyota for MWR in 12 of the final 13 races. He was originally scheduled to drive just three more times. Waltrip will race the No. 55 at Talladega as previously scheduled.
Martin has 40 wins and 56 poles in 870 career Sprint Cup starts.
‘‘My motivation for racing is not for points, it’s for racing,’’ Martin said. ‘‘I want to race, and I want to finish.’’
Martin will be the third driver in the No. 14 this season. Max Papis drove the Toyota in Stewart’s absence at Watkins Glen. The No. 14 car is 13th in the owner standings.
— The Associated Press