Trying for a sweep of the season series after defeating California 4-3 in Berkeley on Feb. 21, Stanford also had its 10-match winning streak come to an end. It was the Cardinal's longest stretch since running off 13 straight wins in 2011.

That being said, the Cardinal will be seeded No. 1 in next week's Pac-12 Championships in Ojai, thanks to a 4-3 upset of the Trojans last week.

Despite suffering its first loss since Feb. 28, Stanford (16-5, 6-1 Pac-12) clinched a share of the Pac-12 regular-season championship, something it last accomplished in 2010. USC defeated UCLA on Thursday to also enter the postseason as co-champions.

With the Pac-12 title hanging in the balance, Billy Griffith outlasted Nolan Paige, 3-6, 7-6 (5), 6-4, at the No. 5 spot, as No. 28 California held on to knock off No. 24 Stanford, 4-3, on Saturday afternoon at Taube Family Tennis Stadium.

Stanford head coach Paul Goldstein congratulates Nolan Paige, who battled from behind before dropping the deciding match in a 4-3 loss to visiting Cal on Saturday. Photo by Keith Peters/Palo Alto Online Sports.

Stanford senior John Morrissey had plenty to celebrate when his three-set victory deadlocked the Cardinal at 3-3 with Cal on Saturday. Photo by Keith Peters/Palo Alto Online Sports.

Stanford senior Robert Stineman (right) consoles Nolan Paige, who lost the deciding match in the Cardinal's 4-3 loss to visiting Cal on Saturday. Photo by Keith Peters/Palo Alto Online Sports.

Paige trailed 4-0 and 5-2 in the third set but bounced back to win back-to-back games. However, Griffith eventually regained control and closed out the match 6-4.

Cardinal senior John Morrissey rallied for a 4-6, 6-3, 6-3 victory at the No. 3 position that knotted the match at 3, and the focus quickly switched to the back courts.

Momentum shifted to the Golden Bears, who tacked on two more victories to grab a 3-2 lead. Former Menlo School standout J.T. Nishimura defeated Robert Stineman, 7-5, 7-5, on court four before Oskar Wikberg downed Cardinal freshman David Wilczynski, 6-3, 6-3, on court three.

Stanford, which lost to California for only the fourth time in the last 13 matches, remains in good shape for the postseason after finishing fourth in the Pac-12 while being ranked between No. 7-13 in the country throughout the season. The Cardinal's five losses are its most since a 19-5 finish in 2009.

Playing short-handed with 20th-ranked Caroline Doyle out of the singles lineup due to injury, the Cardinal (15-5, 7-3 Pac-12) had its six-match winning streak halted while the Golden Bears (19-3, 9-1 Pac-12) earned a second-place finish in conference play.

No. 11 Stanford dropped a 5-2 decision to No. 4 California on Saturday afternoon in Berkeley in the final match of the regular season for both teams.

Stanford will play its first match at the Pac-12 Championships on Friday, April 24, at 12 p.m.

Stanford's points came from Carol Zhao, who beat Klara Fabikova 7-5, 6-2 at the No. 1 spot, and Ellen Tsay, who breezed past Karla Popovic 6-2, 6-4 on court five.

Denise Starr followed with the clincher, a 6-3, 6-4 triumph over Taylor Davidson at the No. 2 position.

The Golden Bears quickly made it 3-0 with a pair of singles wins at the bottom of the lineup. Lynn Chi booked a 6-1, 6-0 victory over Lindsey Kostas, playing her first career match at No. 5, before Cecilia Estlander notched a 6-0, 6-1 win over Paulette Wolak, making her first career dual match appearance overall.

California, which also defeated Stanford 4-3 at Taube Family Tennis Stadium on March 1 in the non-counting Pac-12 match, locked up the doubles point for a 1-0 lead with wins at Nos. 1 and 2.

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Stanford men lose to Cal, share Pac-12 tennis title