In the other games, defending champion Agencia Grande pulled a 70-69 squeaker over the AC Sports of GAA president Lito Posadas, while Aqua Serv bounced back from a big loss to Rama-Bullo last Friday at the expense of the Ludo/RDM, 61-56.
The 4-0 Ygpit Sportwear was led by Serge Cortes who scored 15 points.
Leopard, led by Atty. Jun Felicitas, dropped to 1-4, while Rain or Shine is mire down the rear with BJL, which is also winless in four games.
After an upset loss to G&S International, Fontana swiftly rebounded behind a 27-point show by leading scorer Gil Villahermosa. Jun Basalo backed up Villahemorsa in the scoring spree with 20 points.
Agencia Grande, which started the tournament with a 1-2 win-loss card, scored a twinkill over the weekend to improve its record to 3-2 in a tie at third place with Aqua Serv and Fontana.
Irenio Ibo led Agencia Grande with 15 points.
Posadas and Norwin Honoridez had 16 and 10 points, respectively, for AC Sports, which fell to 2-2 in a tie with G&S International and Ludo-RDM.
Ed Francisco had 12 points for Aqua Serv, while Ricaña brothers Glenn and Allan combined for 21 markers.
The scores
First game
Ygpit (74) - Cortes 15, Baclayon 12, Matudan 8, Ygpit 6, Nabua 6, Posadas 6, Diola 5, Verano 4, Ancot 3, Pacis 3
Leopard (66) - Dela Cruz 12, Suan 11, Abellana 10, Lasparillas 9, Lumapas 8, Felicitas 7, Aniñon 5, Magno 4 Second game
Fontana (79) - Villahermosa 27, Basalo 20, Sanoy 12, Elizalde 8, Jacalan 7, M. superales 4, K. superales 3
Rain or Shine (76) - Del Rosario 20, Vertudazo 14, Torrepalma 10, Hernandez 10, Tablada 7, Bacalla 6, Delos Cientos 5, Nuñez 2, Fernando 2