The NCAA Season 81 basketball tournaments are tournaments of the Philippines' National Collegiate Athletic Association for basketball at the 2005–06 season. The tournaments are divided into two divisions: the Juniors tournament for male high school students, and the Seniors tournament for male college students. Colegio de San Juan de Letran hosted the season, starting with an opening ceremony held at the Araneta Coliseum on June 25, 2005 followed by a double-header. Games in the elimination rounds and semifinals then are subsequently held at the Cuneta Astrodome, with the Finals played at the Araneta. Seniors' games are aired lived by ABS-CBN Sports via Studio 23. Seniors' tournament Teams Elimination round Team standings Match-up results Scores Results on top and to the right of the dashes are for first-round games; those to the bottom and to the left of it are second-round games. Postseason teams Letran Knights The Knights had an amazing streak of eleven straight wins right from opening day. The streak was threatened when they faced fellow unbeaten team, the PCU Dolphins, at the end of the first round. Both sporting 6-0 records, the game went into overtime, and Boyet Bautista and John Paul Alcaraz saved the day for the Knights beat the Dolphins resulting a first round sweep. The streak ended when the Mapua Cardinals, led by the former All-Canadian Kelvin dela Peña beat the Knights as Letran failed to stop dela Peña and collapsed at the end game.(If Letran won that 2nd round game against Mapua, the Knights could have already scored a 14-0 sweep of the eliminations) The Knights recovered as they blew out the Stags, and swept the regular season series vs. PCU in the season finale. PCU Dolphins The defending champions PCU Dolphins also had their own 6-0 streak, beating Mapua and CSB. But it was ended by Letran (see above) in a tight contest. Then came the shock loss against the San Beda Red Lions under San Beda's debuting coach Koy Banal. The Dolphins bounced back, beating last year's runner-up UPHSD Altas. However, PCU was defeated by the San Sebastian Stags in their second round rematch. On the next game, they clinched the twice to beat advantage when they beat Mapua. However, they failed to beat Letran in the regular season. Mapua Cardinals The Mapua Cardinals had their best start in fourteen years as they boasted a 4-0 card. But losses against defending champions