Division I women's volleyball became an NCAA-sanctioned sport in 1981. But some of the game's fiercest rivalries began long before that year.
Here are the oldest rivalries in Division I women's volleyball:
Penn State vs. Pittsburgh
Penn State and Pittsburgh first met in women's volleyball on Oct. 29, 1977. The Panthers won 2-0 in straight sets, and would win the next seven meetings until Penn State got its first victory of the series (3-0) on Nov. 12, 1979.
The Nittany Lions now lead the all-time series 33-18, and had won 16 straight over the Panthers until Sept. 20 of this season. Pittsburgh upset Penn State 3-0 to secure its first win over the in-state rival since Nov. 8, 1987.
VOLLEYBALL RANKINGS: Check out the latest AVCA Coaches Poll right here
Two days later, Penn State bounced back with a five-set victory over Pittsburgh to split the home-and-home tilt.
In the nearly 32 years between Pitt wins in head-to-head play, the Nittany Lions morphed into a volleyball powerhouse. They won seven national championships between 1999-2014, including back-to-back 38-0 seasons in 2008 and 2009.
Nebraska vs. Stanford
Stanford and Nebraska have alternated as national champions for the past four years. They've also met twice in the national championship, with each team winning once. The Cornhuskers won 3-1 in 2006, while the Cardinal took last year's title with a 3-2 victory.
Stanford won the first meeting in the series 2-0 on Nov. 5, 1976 and took the next two as well before Nebraska emerged victorious in the 1986 national semifinal meeting. Stanford currently leads the all-time series 10-6.
The rivalry's most recent installment came on Sept. 18, 2019 in a rare regular-season showdown between the top two teams in the nation. The No. 2 Cardinal knocked off the top-ranked Huskers 3-1 in Lincoln, Nebraska.
No. 2 @StanfordWVB went into one of the most hostile NCAA Volleyball environments and topped No. 1 Nebraska on the Huskers' home court.— NCAA Volleyball (@NCAAVolleyball) September 19, 2019
Kathryn Plummer led the Card to its 3-1 win with 19 kills and 4 aces.#NCAAVB pic.twitter.com/zEwEH6B1V0
Southern California vs. UCLA
These Pac-12 rivals first met on Nov. 11, 1970, with UCLA winning in straight sets 2-0. The Bruins lead the all-time series 65-59, and won their first 11 matches against Southern California.
PURSUIT OF PERFECTION: Tracking undefeated DI women's college volleyball teams
But the Trojans beat UCLA 3-2 to win the first official NCAA women's volleyball national championship in 1981. USC is a perfect 3-0 all-time in head-to-head NCAA tournament meetings. Despite seven titles between the two, it remains the only time they've met up in the final.
They'll square off for the 125th time Friday, Nov. 29 at 10:00 p.m. ET.
Penn State vs. Stanford
The rivalry between Penn State and Stanford (which began on Dec. 10, 1992) is easily the youngest on this list. But with the schools having met four times in the national championship, it's impossible to overlook the history between these two.
Stanford won its second-consecutive national title (and fourth in the previous six seasons) by defeating Penn State 3-2 in 1997. The Nittany Lions won their program's first championship in straight sets over the Cardinal in 1999.
Almost a decade later, Penn State won the first two of its four straight national titles (2007-2010) over Stanford.
These two schools have won a combined 15 of the 38 Division I women's volleyball championships. The all-time series between these powerhouses is tied 12-12 after Stanford won the last meeting 3-1 back on Sept. 13.
Stanford vs. UCLA
Another Pac-12 rivalry, Stanford and UCLA first met in women's volleyball on Oct. 15, 1976. The Bruins won 3-0, but the Cardinal lead the all-time series with a commanding 53-40 advantage. Stanford won 18 straight matches in the rivalry from Oct. 11, 2001 to Oct. 2, 2009.
Eight of the 93 all-time meetings took place in the NCAA tournament, with UCLA holding a 5-3 edge in postseason affairs. But the Bruins are just 1-2 against the Cardinal in national championship matches.
LIVE SCORES: Track women's volleyball scores
UCLA outlasted Stanford 3-2 for its first title in 1984. The Cardinal won their first and second championships against UCLA in 1992 and 1994, respectively.
As for some more recent history, Stanford has won four straight against the Bruins. The two teams will meet again twice this season, at UCLA on Friday, Oct. 25 and at Stanford on Sunday, Nov. 17.