Pierce sank some key baskets in the late going and Garnett grabbed eight rebounds for the Celtics.
Ray Allen contributed 15 points and Rajon Rondo finished with 12 points and 10 assists as Boston shook off a Sunday loss to the Los Angeles Lakers.
The Clippers -- losers of four of the their last five games -- were led by Blake Griffin's 24 points and nine rebounds.
Mo Williams added 21 points.
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WASHINGTON, May 19 (UPI) --Television actress Christine White has died in Washington, her representatives announced. She was 86.
MOSCOW, May 19 (UPI) --A biological research satellite capsule returned to Earth Sunday with its mice, gerbils, geckos and plants after a 30-day flight, Russian space officials said.