MORAGA, Calif. - Matthew Dellavedova hit five 3-pointers on the way to 26 points and also dished out six assists, and Saint Mary's pulled off a rare rout of No. 21 Gonzaga with an 83-62 win Thursday night in a matchup of the West Coast Conference's fiercest rivals.

Brad Waldow added 17 points and 10 rebounds and Stephen Holt had 13 points and six assists for the Gaels (16-2, 5-0) at a rocking McKeon Pavilion, where a standing-room only crowd packed the arena for a nationally televised showdown that's always the biggest draw of the season here. Students stormed the court after the final buzzer.

Elias Harris had 17 points and 11 rebounds and Kevin Pangos scored 12 for the Bulldogs (13-3, 3-1), who had their eight-game winning streak snapped. Gonzaga lost in early December to Illinois and Michigan State, marking another tough nonconference schedule under coach Mark Few.

Clint Steindel knocked down a 3 with 15:25 left that put Saint Mary's ahead 48-37 and the Gaels made key stops down the stretch to extend the lead. They won their sixth straight since losing to now-No. 4 Baylor 72-59 on Dec. 22.

Dellavedova hit key 3s with 10:05 left, at the 5:22 mark and again with 3:43 remaining to keep his team in control. He had a lay-in with 2:52 to go and jumped in the passing lanes on defense to cause havoc for the Zags.

The gutsy Australian guard - who had a career-high 27 points in Monday's win over San Francisco - sat down to a rousing ovation with 1:29 left. He finished 10 for 16 from the field - 5 of 10 from long range - and scored 15 of his points in the first half, including six during an 8-0 spurt to end the half and give the Gaels a 37-29 lead at the break.

Saint Mary’s held Gonzaga’s big men in check. Gaels center and leading scorer Rob Jones did his part on both ends despite getting just two points to go with 11 rebounds and eight assists.

The 7-foot Robert Sacre, Gonzaga’s third-leading scorer at 11.5 points per game, missed all four of his field goal tries in the first half and began the final 20 minutes on the bench with Sam Dower in the game instead. Sacre checked in with 15:23 to play and wound up with four points on 1-for-7 shooting and three rebounds.

This was a rare lopsided result in one of the nation’s more underrated rivalries.

These teams have combined to win every WCC regular-season title since 2001. The perennial favorite Zags were picked by the WCC coaches to win a 12th consecutive crown, with Saint Mary’s at No. 2.

Several former stars from both schools were in attendance — ex-Saint Mary’s center Omar Samhan and David Pendergraft of Gonzaga. Matt Santangelo, another former Zags great, worked the game for TV.

Gonzaga plays at Loyola Marymount on Saturday.

GONZAGA (13-3)

Sacre 1-7 2-4 4, Harris 8-14 1-2 17, Pangos 4-9 1-2 12, Bell 2-7 0-1 6, Hart 0-0 0-0 0, Carter 2-5 0-0 5, Landry Edi 2-4 0-1 4, Stockton 1-3 1-2 4, Spangler 1-1 0-0 2, Dower 1-4 6-6 8. Totals 22-54 11-18 62.

SAINT MARY’S (16-2)

Waldow 6-8 5-7 17, Jones 1-6 0-0 2, Page 0-5 2-2 2, Dellavedova 10-16 1-2 26, Holt 5-8 2-2 13, Young 4-5 4-6 12, Rowley 0-0 0-0 0, Steindl 2-7 0-0 6, Levesque 0-0 0-0 0, Petrulis 0-1 0-0 0, Williams 1-1 0-0 3, Walker II 1-2 0-0 2. Totals 30-59 14-19 83.

Halftime_Saint Mary’s (Cal) 37-29. 3-Point Goals_Gonzaga 7-15 (Pangos 3-6, Bell 2-3, Stockton 1-2, Carter 1-2, Harris 0-1, Dower 0-1), Saint Mary’s (Cal) 9-25 (Dellavedova 5-10, Steindl 2-6, Williams 1-1, Holt 1-2, Walker II 0-1, Page 0-2, Jones 0-3). Fouled Out_None. Rebounds_Gonzaga 33 (Harris 11), Saint Mary’s (Cal) 36 (Jones 11). Assists_Gonzaga 16 (Pangos 4), Saint Mary’s (Cal) 21 (Jones 8). Total Fouls_Gonzaga 16, Saint Mary’s (Cal) 19. A_3,500.