PORTLAND, Ore. -- Damian Lillard had 32 points and the Portland Trail Blazers avoided elimination from the playoffs with a 99-92 victory over the Memphis Grizzlies on Monday night.
Memphis led by as many as 10 points in the fourth quarter, but Portland rallied to deny the Grizzlies their first-ever playoff sweep.
LaMarcus Aldridge had 18 points and 12 rebounds for Portland.
Game 5 is Wednesday in Memphis.
Memphis was playing without point guard Mike Conley, who was inadvertently elbowed in the face in the third quarter of Game 3 and underwent surgery on Monday morning. His status for the rest of the playoffs is uncertain.
The winner of the series goes on to face the Golden State Warriors in the second round.
Marc Gasol led the Grizzlies with 21 points.
CJ McCollum added 18 points for the Blazers, who snapped a seven-game losing streak to the Grizzlies - including all four regular-season meetings.
The Blazers closed to 80-76 with 6:30 left on Lillard's 18-foot pull-up jumper. After Gasol's reverse layup, Aldridge made four straight free throws to further narrow the margin and McCollum's layup with 4:50 left knotted it at 82.
Gasol's hook shot on the other end denied Portland the lead but McCollum made another layup to tie it again with 2:36 to go.
Gasol made two free throws but Lillard hit a 3-pointer and a free throw to make it 88-86 with 1:58 left. Zach Randolph's layup tied it again for the Grizzlies before McCollum's 3-pointer put the Blazers up 91-88.
Courtney Lee's layup closed the gap to 92-90 with 19 seconds left. Lillard added two free throws before Gasol dunked, but Lillard and Batum each made two free throws before Aldridge's layup at the buzzer.
Nick Calathes started for the Grizzlies in Conley's place. It was his first career playoff start and first of the season. He finished with 12 points on four 3-pointers.
Beno Udrih, who had 20 points in the opener, hurt his ankle in the first half of Game 2, but returned in the third quarter and finished with 10 points. He warmed up Saturday night but didn't play.
Meyers Leonard hit a 10-foot jumper and added consecutive 3-pointers to put Portland up 35-30. Aldridge's layup gave the Blazers a 43-37 and they went on to lead 55-48 at halftime.
Memphis opened the second half with a 10-2 run capped by Lee's 3-pointer to go up 58-57.
Lee's long jumper put Memphis in front 62-57 and Portland went cold, going 0 for 10 from the field until McCollum's layup with 5:32 left.
The Grizzlies outscored the Blazers 27-13 in the third quarter and carried a 75-68 lead into the final period.
Jeff Green's 3-pointer gave the Grizzlies the biggest lead of the game, 80-70, with 8:48 left.
Grizzlies: The Grizzlies became the first Western Conference team have fewer than eight turnovers in three postseason games since the 2007-08 Hornets. ... The team does not yet know when Conley may be available.
Blazers: It was the first time Portland had led at the half since April 8, a stretch of eight games. ... Blazers reserve center Chris Kaman was listed as probable with a left ankle sprain, but did not play.