There really isn’t much gray area when it comes to Stanford coach Johnny Dawkins’ idea of defense.It’s a pretty simple approach.”You either buy into it, or you won’t be playing,” reserve guard Anthony Brown with a grin after the Cardinal beat UC Davis 70-49 on Friday night. “It’s not hard to buy into it at all.”Apparently, it’s working.Stanford (4-0) has held its first four opponents this season to 60 points or less. The last time the Cardinal did that, they won 28 games and made it all the way to the Sweet 16.That might be a difficult feat to match this year, but Dawkins knows if Stanford is to have a chance, it’ll start with the defense.”That’s the most important thing for us,” Dawkins said. “We’ve tried to establish that as our identity. If we want to have a successful year or be successful at all, we have to go out there and defend first.”Anthony Brown had 14 points and six rebounds, Dwight Powell scored 13 points and Stanford used a big run in the second half to pull away from the Aggies.Brown, who hadn’t scored in 27 minutes over his previous two games, made 6 of 10 shots from the floor to give the Cardinal a boost in their first road game of the season.The reserve guard looked much more relaxed after admitting to pressing in the two games before Friday.”This game I just wanted to play within myself,” Brown said. “I’m a shooter, and the last two games, I wasn’t really shooting. This game I was playing free, so to speak, and that helped me.”Josh Owens added 10 points for Stanford.Josh Ritchart had 19 points and five rebounds to pace the Aggies (1-4).Stanford hadn’t played at UC Davis since losing 64-58 in The Pavilion on Dec. 4, 2005. It was the Aggies’ first-ever win against a Pac-12 school in 59 tries.The two teams have played twice since, with the Cardinal winning both times at Maples Pavilion by an average of 14 points.This one was much like the previous two.Brown shrugged off his slow start this season to get Stanford going early, then the Cardinal coasted late when Dawkins emptied his bench.UC Davis trailed by as many as 26 points and was never closer than 20 over the final 6:30.The Aggies, who lost their two leading scorers from a year ago to graduation, shot 38.5 percent from the floor and were 4 of 14 on 3-point attempts.”I think we were a little deer in headlights,” UC Davis coach Jim Les said. “They were the aggressor on the road, and we were a little too passive.”The Cardinal didn’t have as many problems offensively but committed 12 turnovers, an ongoing issue for the team. They averaged slightly more than 15 turnovers through their first three games.Stanford’s defense made it a moot point, holding UC Davis to 15 field goals.Brown scored six straight points early in the first half to give the Cardinal a lift. Owens added 10 points on 5 of 5 shooting, including a breakaway dunk, as Stanford built a comfortable lead.Powell, who missed the first two games of the season with a sprained left ankle, provided an emphatic stamp on the first half for Stanford when he drove the left baseline and dunked over J.T. Adenrele before glaring at the Aggies’ freshman forward.UC Davis shot 6 of 17 and had 12 turnovers before halftime to go into the break down 36-19.The Aggies scored the first nine points of the second half to pull within eight before Brown and Aaron Bright made consecutive 3-pointers for the Cardinal.