IOWA — Three-time NASCAR Sprint Cup Series champion Tony Stewart has ruled himself out for the rest of the season due to the broken right leg he suffered in a car crash earlier this month. Stewart, who suffered a broken tibia and fibula in an Aug. 5 sprint car race in Iowa, will be replaced on his Stewart-Haas team by veteran driver Mark Martin and Austin Dillon for the remainder of the 2013 campaign. “Obviously, I'm disappointed to be out ... but the team is in very good hands with Mark Martin and Austin Dillon,” Stewart, 42, said in a statement. Dillon, who finished 14th at Michigan after replacing Stewart in the Stewart-Haas No. 14 Chevrolet, will also drive for the team in the Oct. 20 Talladega event. — Reuters