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Stanford, Calif. • Nick Johnson kept Arizona's perfect season going for another game, hitting a go-ahead 3-pointer with 51 seconds left and two free throws with 5.8 seconds to go as the top-ranked Wildcats survived for a 60-57 victory over Stanford on Wednesday night for their school-record 21st straight win.

After Johnson hit a jumper in the middle of the key with 2:36 remaining to make it 55-53, Dwight Powell answered on a baseline drive with 1:21 to go before Johnson delivered once more.

Johnson finished with 16 points, five rebounds and four assists and T.J. McConnell added 11 points, eight rebounds and four assists for Arizona (21-0, 8-0 Pac-12), off to the program's best start in conference play in more than a decade.

Arizona is one of three unbeaten teams left in Division I, joining No. 2 Syracuse, which also won Wednesday night. Fourth-ranked Wichita State hasn't lost either.

No. 2 Syracuse 67, Wake Forest 57 • In Winston-Salem, N.C., freshman Tyler Ennis scored 16 of his 18 points in the second half and Syracuse matched the best start in program history.

C.J. Fair added 16 points for the Orange (20-0, 7-0 Atlantic Coast Conference) while Trevor Cooney scored all eight of his in the final 1:45.

The Orange pulled away late while sidestepping a possible trap with a visit from No. 17 Duke coming up this weekend. —

Wednesday's Top 25 scores

• No. 1 Arizona 60, Stanford 57

• No. 2 Syracuse 67, Wake Forest 57

• No. 6 Kansas 92, No. 16 Iowa State 81

• Northwestern 65, No. 14 Wisconsin 56

• No. 19 Saint Louis 77, Richmond 57

• St. Bonaventure 78, No. 21 UMass 65

• No. 22 Memphis 69, UCF 59

• Penn State 71, No. 24 Ohio State 70 (OT)