No. 2 Oregon 57, Colorado 16: Marcus Mariota threw a season-high five touchdown passes - three in the first half to go along with two rushing scores - as the visiting Ducks won their 32nd straight game against an unranked opponent.

Bralon Addison and Josh Huff caught two touchdown passes among their five receptions apiece, with Addison recording a career-high 158 yards and Huff 103 to help the Ducks (5-0, 2-0 Pac-12 North) reach 50 points for the fifth consecutive game. Byron Marshall added 122 yards rushing for Oregon, which outgained the Buffaloes 755-374.

Mariota, an early Heisman Trophy favorite, passed for 261 yards in the first half and Oregon racked up 415 total yards prior to the break en route to a 43-16 lead. The 6-4, 211-pound sophomore finished 16-of-27 for 355 yards and didn't finish a game for the 14th time in 18 career contests.

The Buffaloes (2-2, 0-2 Pac-12 South) reached into their bag of tricks to take a 10-8 lead 5:25 into the game. Wide receiver Paul Richardson took a double-reverse handoff and launched his first career pass - a 75-yard touchdown to a wide open D.D. Goodson, who outran the Oregon defense for the final 62 yards.

Oregon answered with 21 consecutive points - highlighted by a one-play, 75-yard drive when Mariota hooked up with Addison - and Mariota completed his first-half onslaught on a 4-yard touchdown pass to Huff with 57 seconds left. Mariota connected with Addison and Huff again for TD passes in the third quarter.

GAME NOTEBOOK: Richardson finished with 134 yards on five receptions for Colorado, which has been outscored 172-32 in losing all three games to Oregon since joining the Pac-12 Conference in 2011. ... Junior RB De'Anthony Thomas, the Ducks' top offensive threat who scored six touchdowns in the first three games before leaving last week's contest when he injured his ankle on the opening kickoff, did not play. ... The Ducks have scored 31 of their 39 offensive touchdowns on drives of less than two minutes, including 5-of-8 against the Buffaloes.