"Doc never stops going and grinding," Kawhi Leonard said, according to The Associated Press reported.
"He never gets bored."
Damian Lillard and CJ McCollum led Portland with 22 points apiece, but surprisingly both got blanked in the fourth quarter. That's usually Lillard's time to shine, but the Clippers' defense wasn't having it.
"Usually I can make those shots down the stretch, but they weren't falling," Lillard said.
"They were coming out to guard me and picking up full court. Pat Beverley did a good job on defense."
Lillard missed four shots and went 0 for 3 from three-point range, while McCollum also missed four shots.
"It's the third game that we've won, in my opinion, completely because of our defense," Rivers said.
"Our offense was below average. If you can win a game and not play well offensively, that says a lot about your team."
Leonard had 27 points, 13 rebounds and six turnovers after missing a nationally televised loss to Milwaukee the previous night as part of load management for his knee.
"Over the last six minutes of the game, we got stops, got rebounds and made our free throws. Lou also made a big 3 for us," Leonard said.
"We played good defense and stuck in there the whole game and we stayed positive. It was a grind-out win for us."
Leonard and Williams combined to score the Clippers' final 15 points. Leonard sealed the win with four straight free throws as fans chanted "MVP! MVP!"