SAN DIEGO (Ticker) -- San Diego State held Cecil Sapp in check, but it could not contain Bradlee Van Pelt.
Van Pelt rushed for 93 yards and two touchdowns on 13 carries and passed for three more scores as No. 17 Colorado State remained the only unbeaten team in the Mountain West Conference with a 49-21 victory over the Aztecs.
Van Pelt has rushed for 707 yards this year, a Colorado State single-season school record for a quarterback.
He tossed an 11-yard TD pass to Henri Childs in the first quarter, then added scoring strikes of 80 and seven yards to Joey Cuppari in the second period. Cuppari finished with three receptions for 116 yards.
Van Pelt made his 20th career start and improved to 15-5. The Rams remained one game ahead of New Mexico, which defeated Brigham Young on Saturday.
Colorado State (8-2, 5-0) outscored San Diego State, 21-14, in a wild second period to open a 35-14 halftime lead.
Van Pelt tossed a 17-yard TD pass to Matt Bartz in the third quarter and added a five-yard TD run early in the fourth period to make it 49-7.
Sapp rushed for only 80 yards on 20 carries, but gave Colorado State a 14-0 lead with a two-yard TD run with 2:45 left in the first quarter. He also got plenty of help as the Rams amassed 533 yards of total offense and stretched their winning streak to five games.
Lon Sheriff and Adam Hall combined to complete 28-of-48 passes for 348 yards and three touchdowns for San Diego State. But the Aztecs were held to just 30 yards on the ground. Hall left the game after suffering a concussion.
San Diego State (3-8, 3-3) has dropped three in a row after winning three straight. The streaky Aztecs opened the season with five straight losses before winning their first three conference contests.
Sapp, who has run for more than 1,302 yards this year, was held to his second-lowest total of the season. He gained 80 yards in Colorado State's win over Colorado on Labor Day weekend.
Colorado State avenged 14-7 loss to San Diego State last season and cut the Aztecs' lead in the all-time series to 12-10. The Rams have won five straight at San Diego State.
Colorado State has not lost at Qualcomm Stadium since 1993, Sonny Lubick's first season as coach.