Michigan forward Will Tschetter, right, watches his shot attempt as he is guarded by Ohio State forward Puff Johnson during the second half on Friday in Ann Arbor. (AP photo)

Arizona remained the unanimous No. 1 team in the AP Top 25 men’s college basketball poll before the Wildcats’ Monday night showdown at No. 13 BYU, while fellow unbeaten Nebraska climbed to a program-best fifth ahead of its big week in the Big Ten.

The Wildcats, riding their best start since the 2013-14 season, received all 60 first-place votes from the national media panel to easily outdistance second-place UConn and third-ranked Michigan, whose places remained unchanged from last week’s poll.

Arizona was 20-0 going into the week, just the third 20-game win streak in program history.

“We’re just trying to win one game every week, or however many games we have, and I think we’re doing a good job of it,” Wildcats freshman star Koa Peat said. “Just keep doing what we’re doing, and keep getting better as a team.”

Duke remained No. 4 ahead of the Huskers, who also are 20-0 and climbed two more spots from last week. Nebraska has won 24 in a row dating to last season, the longest win streak by any Big Ten team since Ohio State won 24 straight to start the 2010-11 season.

Just like Arizona, the path to stay perfect is perilous. The Huskers visit Michigan tonight and play No. 9 Illinois on Sunday.

“Heck of a team, man,” Northwestern coach Chris Collins said after the Huskers beat his own team a couple of weeks ago. “It’s really refreshing to watch the purity they play with, the joy they play with, the toughness they play with.”

Gonzaga moved up two spots to sixth after narrowly avoiding an upset loss to San Francisco. The Bulldogs were followed by Michigan State in seventh, Iowa State, the Illini and Houston, which remained in the top 10 for a 23rd straight poll despite its loss to Texas Tech.

The Red Raiders were right behind at No. 11 following wins over Baylor and their 90-86 triumph over the Cougars on Saturday.

Purdue tumbled eight spots to No. 12 following back-to-back losses to UCLA and Illinois. BYU stayed put at No. 13, Kansas climbed five spots to No. 14 ahead of its matchup with BYU on Saturday, while Arkansas also moved up five spots to round out the top 15.

St. John’s, the preseason No. 5, returned to the poll for the first time since dropping out in mid-December following wins over Seton Hall and Xavier, the latter giving coach Rick Pitino his 900th win. Georgia dropped out after a lopsided loss to Texas.

Rising and falling

North Carolina made the biggest climb this week, moving up six spots to No. 15 after wins over Notre Dame and then-No. 14 Virginia. Kansas and Arkansas were just ahead of the Tar Heels after moving up five spots apiece.

Purdue’s eight-spot fall to No. 12 dropped the Boilermakers out of the top 10 for the first time this season. Alabama fell six spots to No. 23 following its loss to Tennessee, while Houston and Clemson each fell four spots after losses last week.

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