Logan, Utah ? Doug Martin ran for 121 yards and four touchdowns, and No. 6 Boise State remained unbeaten and in BCS contention with a 52-21 victory over Utah State on Friday night.

Jeremy Avery added 116 yards rushing and two touchdowns for the Broncos (11-0, 6-0 Western Athletic Conference), who gained 243 yards and scored four TDs in the second quarter — two 43 seconds apart to break a 14-all tie.

Boise State added another touchdown barely two minutes into the third quarter, and what was a close game for about 25 minutes turned into the rout it was expected to be.

Utah State (3-8, 2-5) fell to 1-51 against ranked teams.

Boise State’s Kellen Moore was a modest 15-for-29 for 233 yards with a touchdown, breaking a streak of six straight games with three or more touchdown passes. But he had enough help in the backfield that it didn’t matter.

The Broncos rushed for a season-high 323 yards and outgained the Aggies, 572-363.

Diondre Borel was 18-for-30 for 201 yards and kept the Aggies alive by avoiding several sacks with his speed, but the Broncos eventually started catching him, and Utah State didn’t have enough other weapons to keep up after matching Boise State’s first two touchdowns.

After Robert Turbin tied it at 14 on a 24-yard run for the Aggies with 6:28 left in the second, the Broncos drove 73 yards in four plays to retake the lead for good. Titus Young made a diving grab with a defender all over him for a 56-yard catch at the two, where Martin easily ran it in for a 21-14 lead.

Then Utah State fumbled a handoff, and Ryan Winterswyk recovered at the nine for the Broncos, and Avery scored on first down, putting the Broncos up 28-14 with 4:04 left in the quarter.