Part of the reason might have been because the opponent plays in an inferior division, but Cal freshman Keenan Allen sure made college football look easy in his debut Saturday afternoon. Allen, who came to Berkeley out of Greesnboro, N.C., as one of the top recruits in the country, made UC Davis' defense look laughable in the Bears' season-opening 52-3 victory in front of 58,040 at sun-splashed Memorial Stadium. Allen caught four passes for 120 yards and a touchdown and added 38 yards and a score on the ground, making for one of the more memorable Cal introductions in recent memory. "He's unreal," Cal linebacker Mike Mohamed said. "He was making big play after big play. Everything he did today, we saw in camp. To us, it's no surprise. We expect to see a lot more of that this year." Allen was rated as the fifth-best prospect in the country by rivals.com and made an immediate impact during training camp, earning a starting spot after just a few days. The first time he touched the ball against UC Davis came on a lateral from quarterback Kevin Riley, and Allen evaded an attempted tackle by Aggies cornerback Jonathan Calhoun en route to a 17-yard gain. Early in the second quarter, Allen took a handoff on an end around and looked down field to pass. The intended receiver was covered, so Allen reversed field and ran 18 yards for a touchdown.