OXFORD, Miss. (AP) -- Maybe it was Mississippi's offense that scored two fourth-quarter touchdowns and outgained Tulane.

If not for the defense, however, the Rebels (5-1) may not be celebrating a 20-13 victory and their best start since 1990.

	Tulane couldn't stop Ole Miss quarterback Romaro Miller from throwing a go-ahead TD pass in the fourth quarter on Saturday.

Coach David Cutcliffe says this was truly a team effort for Ole Miss (No. 25 ESPN/USA Today, unranked AP).

"Our defense certainly set the tempo. We did some good things through the whole game to contain that offensive team," Cutcliffe said. "And our offense kept them off the field in the first half with long drives."

Tulane (2-3) had three of its four turnovers in the fourth quarter, one of them leading to Joe Gunn's game-breaking 8-yard TD run and the other ending the game.

Gunn rushed for 120 yards, including five straight carries for a touchdown after a Tulane fumble at its own 19. The TD run, on which he broke loose from two defenders near the line of scrimmage, gave Ole Miss a 10-point lead with just 6:54 left.

"Joe is just tough. He was a little beat up, and he just went ahead and played hard. He finds a way of coming up with big plays," Cutcliffe said.

After being held to just 7 yards on five carries in the first half, Gunn had 21 carries for 113 yards after halftime. It was the sophomore's fourth 100-yard game this season and sixth of his career.

Ole Miss outgained Tulane 372 yards to 355, holding the Green Wave 106 yards under their season average.

Tulane (2-3) trailed just 13-10 when Kerwin Jones made a catch, but then dropped the ball with no defenders around him. Anthony Sims, a 250-pound defensive tackle, recovered the fumble to set up Gunn's touchdown drive.

On its opening drive of the game, Tulane had marched down the field only to come up empty. JuJuan Dawson, who had 14 catches for 136 yards, was stripped after making the catch near the goalline. The ball bounced into the end zone and was recovered by Ole Miss linebacker Al Rice.

"You can't drop the football. You can't miss plays and miss opportunities against good football teams," Tulane coach Chris Sceflo said. "We can't miss an opportunity. To go up 7-0 would have been huge."

With the victory, Cutcliffe became only the third Ole Miss coach -- and first since 1938 -- to win six of his first seven games. He made his debut with a win in the Independence Bowl last December after replacing Auburn-bound Tommy Tuberville.

On the first play of the fourth quarter, Ole Miss went ahead to stay 13-10 when Romaro Miller hit Jamie Armstrong for a 15-yard TD pass. That capped a 37-yard drive after a Tulane punt.

"There are always five or six plays during the course of a game that determine the outcome of the game. Without a doubt those three were critical," said Sceflo, referring to Armstrong's TD in the corner of the end zone and his team's two fumbles.

With its come-from-behind victory, Ole Miss extended its non-conference winning streak to 18 straight games over the past five years.

After Gunn's touchdown, the Green Wave drove 38 yards in 10 plays for Seth Marler's career-long 48-yard field goal with 1:19 left. The Green Wave then tried an onside kick, but Ole Miss tight end Doug Zeigler pounced on the ball after it hit off a teammate.

Tulane quarterback Chris Ramsey, the NCAA Division I-A leader in total offense, set school records by hitting 35-of-59 passes. He had 339 yards passing, his fourth straight 300-yard game.

But both of Ramsey's interceptions came in the fourth quarter, the second by Anthony Magee at the 16 on the final play of the game with the Green Wave making a last-ditch effort to score.

Ramsey put the Green Wave ahead 10-6 when he hit Dawson for a 24-yard TD pass midway through the third quarter. Dawson's school-record 26th career TD reception came just two plays after Ramsey's 51-yard completion to John Wilson.

Marler's 29-yard field goal midway through the second quarter tied the game at 3-3.

But Ole Miss responded with Les Binkley's second field goal, a 31-yarder after Miller's 57-yard completion to L.J. Taylor, to take a 6-3 halftime lead.

Tulane's only first-half scoring drive took 16 plays, one play more than Ole Miss needed on its opening possession when Binkley kicked a 24-yard field goal for a 3-0 lead.