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.

No. 2 Syracuse 67, Wake Forest 57

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.

No. 6 Kansas 92, No. 16 Iowa St. 81

LAWRENCE, Kan. — Andrew Wiggins scored a career-high 29 points, including six straight late in the game, to lead Kansas to its seventh straight win.

Wiggins had 27 points in Saturday’s win at TCU, and matched that with an emphatic dunk that gave Kansas an 81-72 lead with just under 3 minutes remaining in the game.

Northwestern 65, No. 14 Wisconsin 56

MADISON, Wis. — Drew Crawford scored a season-high 30 points and JerShon Cobb added all 10 of his in the second half for Northwestern.

It was Northwestern’s first win over the Badgers in Madison since 1996.

No. 19 St. Louis 77, Richmond 57

ST. LOUIS — Jordair Jett had 21 points and a career-best 10 rebounds for Saint Louis which led by 24 points in the first half.

St. Bonaventure 78, No. 21 UMass 65

OLEAN, N.Y. — Youssou Ndoye scored 11 of his 12 points in the second half for St. Bonaventure.

Matthew Wright, who had 11 points, put the finishing touches on the win with a 3-pointer with 55 seconds remaining.