Defending champion Texas is the No. 1 seed in the NCAA women's volleyball tournament.

The Longhorns went 23-2 this season and won the Big 12 championship. They haven't lost a match since Sept. 13.

No. 2 Penn State, No. 3 Washington and No. 4 Missouri also earned top seeds for the 64-team tournament, which begins Thursday.

Texas and Penn State are both currently on 19-match winning streaks and could meet in the national championship. The two volleyball superpower programs have met already this season. On Sept. 7 in Austin, Texas, the Longhorns won 3-2, with the final set going 15-10.

Missouri completed a perfect 34-0 regular season and won the school's first SEC championship in any sport. The Tigers haven't dropped a set since Oct. 25 and haven't played a fifth set all year.

The Pac-12 has the most teams in the tournament with nine, while the Big Ten and SEC each got eight schools in.

Penn State and No. 7 Stanford kept intact their streaks of being the only two programs to be in every tournament since the NCAA took over governance of women's volleyball in 1981.

After two rounds at campus sites, the regionals will take place in Lincoln, Neb.; Champaign, Ill.; Lexington, Ky., and Los Angeles. The regional finals will all air Dec. 14 on ESPNU.

The national semifinals and finals are Dec. 19 and 21 in Seattle and will be shown on ESPN2.