Houston quarterback Case Keenum threw six touchdown passes and became the NCAA all-time total yardage leader as the No. 20 Cougars scored early and often en route to a 63-28 win over visiting Marshall in a Conference USA matchup on Saturday.

It took Keenum and the Cougar offense just three plays to ring up its first score, a 70-yard Keenum-to-Patrick Edwards touchdown pass to give the Cougars a 7-0 lead with 13:52 to play in the first quarter.Marshall (3-5, 2-2 C-USA) closed to within 35-21 with 9:43 to play in the third on quarterback A.J. Graham’s 6-yard touchdown run, but Houston (7-0, 3-0 C-USA) answered on its next possession with an 18-yard Keenum to Justin Johnson touchdown pass and the offensive onslaught continued.

Keenum, needing 130 yards to break former Hawaii star Timmy Chang’s career total yardage record (16,910 yards), reached the mark midway through the first quarter.

Keenum had 295 yards passing and four touchdown passes, two to Michael Hayes, in the half. Marshall got on the board with 3:56 to play in the first with a 1-yard pass from Graham to Aaron Dobson to tie the score at 7.

Keenum finished 24 of 28 for 376 yards. He has now thrown for at least 300 yards in 32 games during his career.