Top-ranked Nebraska, with Mike Rozier scoring two touchdowns, overcame a 10-point deficit and six first-half fumbles to defeat UCLA, 42-10, at Lincoln, Neb., yesterday.

The victory, before a crowd of 76,510, was Tom Osborne's 100th in his 11 years as coach. His first came against UCLA, in 1973. Nebraska (4-0) also ran the nation's current longest winning streak to 14.

"We were our worst enemy for a while today," Osborne said. "It looked like we weren't going to be able to overcome these mistakes . . . If we had come out (in the second half) and turned it over a couple of more times we could have lost the game."

UCLA (0-2-1) scored in the first quarter after Nebraska quarterback Turner Gill had his second fumble of the day, on the Bruins' 34. Ten plays later fullback Frank Cephous dove in from the one.

The Bruins struck again after Mark Schellen fumbled at the UCLA 40. John Lee's 37-yard field goal made it 10-0.

Nebraska scored on its next series, with 7:27 left in the half, on Schellen's 11-yard run. Nebraska then stopped UCLA and three plays later Rozier's five-yard run made it 14-0.

Later in the second quarter Nebraska drove to UCLA's one, but Rozier fumbled out the end zone for a touchback.

After Lupe Sanchez fumbled a punt at UCLA's 18, Rozier, who gained 159 yards on 26 carries, scored from the two on Nebraska's second possession of the third quarter. Gill's nine-yard pass to fullback Tom Rathman made it 28-10 and the Bruins did not threaten again.

UCLA, in its worst start since 1974, was shut down by a defense that held it to 97 yards rushing, 195 passing. The Huskers gained 600 yards, 477 rushing.

Gill, who missed practice Thursday with a back injury, became the school's first quarterback to surpass 1,000 yards rushing. He had 79 yards on 14 carries.

Nebraska's six fumbles brought its season total to 20, with eight lost. It had nine against Penn State in the season opener.