Hapee Toothpaste repulsed John-Os rally in the final three minutes for a 69-62 victory in the second game to forge a three-way tie for the lead.
Wesley Gonzales drilled in 12 of his 20 points in the final half as the Teeth Sparklers avenged their 68-71 setback last April 12 and joined Montana and Viva on top with 2-1 records apiece.
Dennis Miranda scored 10 of his 14 points in the final quarter, leading the Water Force to their second win in three games in the semis.
"This time, we emphasized the value of positive attitude. No revenge, no payback. We just gave our 100 percent in the game," said Viva coach Coy Banal.
Montana stuck close, 68-70, on Jon Dan Salvadors basket in the final 4:13 but two crucial miscues by Gary David paved the way for Jeff Napas charity and Mirandas triple that erected Vivas 74-68 margin, with 3:20 remaining.
The Jewelers misfortunes didnt stop there. David committed two more turnovers, Marlon Basco lost the ball to the baseline while Mark Magsumbol and Jigger Saniel fouled out consecutively in the ensuing play.
A lay-up by Francis Gerard Jones and free throws by Miranda and Ybanez further stretched the gap to 10, 80-70.
Montana dominated the boards, 44-35, and fared better in the field converting 28 of 64 attempts
Aside from Miranda, three other Viva players scored in double figures. Jason Misolas and Margate had 13 points apiece while Sinco added 11.
John-O reeled to its third straight setback.