Both canned two free throws in the dying seconds to power the Marlins to their very first victory after dropping their first five assignments.
The Gems saw their three-game win run snap as they slid to 3-3 in the Southern Conference.
The Marlins could’ve actually won the game in regulation, but Melvin Taguines’ putback off a miss by Peter Naron was counted as time expired, forcing the extension at 93-all.
Socsargen-Taguig again looked headed to victory when it took a 102-97 lead with 1:02 remaining in the game.
But Gems Stephen Padilla and Al Solis came through with a triple each as the Gems regained the lead in the final 25 seconds.
However, Alvarez drove in and converted his charities off Bobby Jose to give the Marlins a one-point lead, 104-103. And after Gem Carlos Sayon committed a passing error, Reyes sealed the outcome with two more free throws off Solis.
Like in their first encounter last Friday, which Cebuana-Lhuillier won, 90-86, neither team led by more than seven points.