It still wasn't enough.
The fourth game in the western conference semifinal ended with the Thunder outlasting the eighth-seeded Grizzlies, 133-123.
The seven-game series is tied at two games apiece. Game 5 is Wednesday night at Oklahoma City. The winner of the series will play the Dallas Mavericks in the conference finals.
Gasol scored 26 points and grabbed 21 rebounds in 57 minutes. Of the boards, 10 were offensive.
The center from Spain also forced a third overtime with a tip-in.
But the effort fell just short.
"Nobody's perfect," Gasol said. "We tried our best. The effort was there. We fought. We scratched, but we couldn't get ahead in overtime."
The thriller was the second straight overtime game in the series the NBA's first triple-overtime playoff game since Chicago downed Boston 128-127 on April 30, 2009.
OKC's Kevin Durant summed it up best, calling it a game that will go down as one of the best in NBA history.
"It was fun. It was something I can tell my kids that I played in a great game like this," Durant said with a smile.
The Thunder blew a 16-point lead in losing Game 3 101-93 in overtime. This time, Memphis was up 18, lost that and fell behind 10 in the fourth quarter only to rally.
Greivis Vasquez, meanwhile, scored 14 points and hit an off-balance, one-handed 3-pointer to set up the second overtime.
The rookie from Venezuela also grabbed four rebounds, dished out two assists and committed no turnovers in 26 minutes.
Based on reporting by The Associated Press.