"Those offensive rebounds at the end just killed us," Marion said.
Paul got fouled and made both shots for a 99-93 lead while fans chanted "MVP!"
"In the fourth quarter, we needed to stay with the aggressiveness," Mavs coach Rick Carlisle said. "But they turned it up and we just didn't get it done. We've got to keep working. We've got to do a few things better, get some more rebounds and knock down some more shots."
Los Angeles played flatly in the third, when the Mavs used a 22-8 run to take a 75-65 lead. Marion's 3-pointer early in the spurt gave Dallas its first lead of the game and snapped the Clippers' streak of leading for 10 straight quarters. The Clippers rallied at the end of the period, scoring seven in a row, punctuated by Barnes' 3-pointer that beat the buzzer to trail 75-72.
"It's disheartening losing these games," former Clipper Elton Brand said. "I haven't been through a stretch like this in a long, long time. We've been competing in most of these games, and we just have to find a way to close them out and win them."
The Clippers led the entire first half, sparked by Barnes' 11 points, including three 3-pointers. The Mavs scored seven straight points to tie the game at 50-all on Collison's hook before Paul got around Mayo to hit a running jumper at the buzzer, keeping the Clippers ahead 52-50 at the break.
NOTES: Jack Ramsay previously held the franchise record for fastest coach to 100 wins, doing so in 223 games with the Buffalo Braves. Former Clippers coach Mike Dunleavy reached the mark in 224 games. ... Clippers G Jamal Crawford returned after missing the last two games because of a sore left foot. "The foot is OK, the legs were a little heavy," he said. ... Clippers F Grant Hill did not make his expected return after missing all season with a right knee bone bruise. Coach Vinny Del Negro said Hill has not had any setbacks and would practice a couple more days before being evaluated for Saturday's game against Orlando. ... The Mavs signed free-agent guard Mike James to a 10-day contract on Wednesday. The 10-year NBA veteran had played two games with the Texas Legends of the NBA D-League.