This was no Saturday afternoon picnic for the Stanford women. For much of the game, nothing came easily for the Cardinal.

Fortunately for them, Taylor Greenfield retained her magic from the Pac-12 Tournament. She spearheaded a 14-0 run in the second half that sparked them to a 73-60 win over Cal State Northridge in the first round of the NCAA Oklahoma City regional at Maples Pavilion.

The outsized but scrappy Matadors, the Big West Tournament champions, led at the half by one and by six early in the second half.

But Stanford (25-9) was too big and too good in the end, allowing coach Tara VanDerveer to chalk up win No. 800 in her career on the Farm.

The 4-seed Cardinal move on to play Monday at 3:30 p.m. against 5-seed Oklahoma, which ended Quinnipiac’s 21-game winning streak in a 111-84 rout.

The Sooners (21-11) had six players in double figures, led by freshman Gabbi Ortiz with 16. Their reserves scored 61 points. Jasmine Martin had 14 points for the Bobcats (31-4).

Ashlee Guay, CSUN’s all-time leader in points, assists and steals, scored 27 points to keep the game close until the final 90 seconds. She hit three straight baskets to cut the Stanford lead to 60-04 with just under two minutes left.

Lili Thompson, Bonnie Samuelson and Greenfield then led a parade of free throw shooters in the last minute and a half to clinch the surprisingly difficult win.

Greenfield reprised her excellent showing in the conference tournament with 199 points, and Thompson added 17 to pace Stanford.

Entering the second half, CSUN (23-10) held a surprising one-point lead. The Matadors kept the pressure on, opening a 36-30 lead after Cinnamon Lister thwarted a layup attempt by Thompson.

Stanford arose from its slumber, however. Jumpers by Thompson and Orrange, a leaner by Greenfield and a layup by Erica McCall pushed the Cardinal in front 38-36.

After giving up a layup to Katelin King, barely beating the shot clock, to tie it 40-40, the Cardinal got a three and a layup from Thompson, then a basket by Greenfield. That ignited a 14-0 run for a 54-40 lead as CSUN went through an 0-for-8 shooting drought.

Stanford jumped out to a 20-7 lead with the help of three treys by Samuelson. Then the Matadors came to life, and the Cardinal went cold.

A layup by Briana Roberson was Stanford’s only basket for the next 9 ½ minutes, as the Cardinal fans looked on in consternation.

Guay and Camille Mahlknecht were hitting, and Stanford seemed to be tightening up. After the Roberson basket, it missed eight straight shots and went scoreless for nearly eight minutes.

Tessa Boagni’s jumper put the Matadors in front 23-22 with just under five minutes left in the half. A Guay layup then completed a 13-0 Northridge run.

Finally, Thompson sank a layup, and Greenfield regained the lead with a jumper. The lead changed hands three more times before the end of the half, with Guay holding the ball for the last shot, then driving for a layup that sent CSUN into the locker room with a 29-28 edge.

The 800-win club

College basketball coaches — men’s or women’s — with 800 wins at a single Division I school

Patt Summitt (Tennessee), 1,098

Mike Krzyzewski (Duke), 940

Geno Auriemma (Connecticut), 922

Dean Smith (North Carolina), 879

Adolph Rupp (Kentucky), 876

Andy Landers (Georgia), 862

Jim Boeheim (Syracuse), 858

Robin Selvig (Montana), 845

Jim Phelan (Mount St. Mary’s), 830

Tara VanDerveer (Stanford), 800