The Arizona Wildcats (1) have sat comfortably atop the top-25 for five weeks, but its strong defense is about to be tested again when they visit the UCLA Bruins.

En route to eight win of the year, Arizona held Duke to 66 points, despite Jabari Parker and Rodney Hood putting up 40 by themselves. UCLA on the other hand, lost to Duke 80-63 in a game where Parker was one of four to reach double-digit point totals.

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UCLA leads the nation with a .527 team field goal percentage, while averaging 87.1 points per game, good for fifth. The Bruins offense has also been run unselfishly as the team averages 18.1 assists per game, fourth in the country.

Arizona's defense has allowed an average of 54.9 points and 36.6 percent field goal shooting per game, a large step down from UCLA's offensive output.

"They're long, they're athletic, they got a good physical presence to them," UCLA coach Steve Alford told reporters, according to ESPN. "Because of their athleticism and length, it makes it hard to get into the things you want to run, so we've got to do a good job of executing our offense."

Arizona has won both of its Pac-12 meetings thus far and UCLA is 1-0 in the conference. In the Bruins' conference opener, they beat USC 107-73, whereas Arizona beat Washington State 60-25 in their first Pac-12 matchup.

"They have firepower behind the arc, they have the firepower with team speed and they're doing a really good job pushing it." Arizona coach Sean Miller told reporters, according to ESPN. "I think it will be potentially our most difficult challenge of the season, when it comes to trying to stop the other team from scoring. They're very efficient right now."

In UCLA's win over USC, the Bruins 11 three-pointers in 23 attempts, so slowing down the team's shooters is going to be a key for the Wildcats. UCLA, on the other hand, must figure out a way to get into their offensive groove early make Arizona play from behind.