Doug Chapman scored three touchdowns and Marshall's defense did the rest as the No. 11 Thundering Herd completed an undefeated season today with a 21-3 rout of Brigham Young in the Motor City Bowl.

"It was a dream come true for the whole team," said Chapman, voted the game's most valuable player.

Chapman, who rushed for 133 yards on 14 carries, ran for two scores and hooked up on a pass play with Chad Pennington for another as Marshall (13-0) remained one of three unbeaten Division I teams, along with Florida State and Virginia Tech.

Marshall, 35-4 since moving up to Division I, has played in the Motor City Bowl all three years. It lost the inaugural game and won the last two.

BYU (8-4), co-champions of the Mountain West Conference, got its lone score on Owen Pochman's 28-yard field goal in the first quarter.

It was all Marshall after that and the Mid-American Conference champions broke the game open with two touchdowns in a 1-minute, 44-second span of the second half.

Pennington, who came in with 3,799 yards passing and 37 touchdowns, completed 17 of 28 passes for 207 yards with one interception.

The Cougars' Kevin Feterik, who passed for 3,554 yards and 25 scores this season, was 6 of 11 for 125 yards before being forced from the game early in the third quarter with a fractured clavicle.

"I threw about three more passes after I got hurt," Feterik said.

"It just kept getting worse."

Marshall finished with 354 total yards and held BYU to 204 yards.

The Cougars had minus-16 yards rushing.