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“My problem was the pace. We were walking the ball up the floor,” Rivers said. “We dribbled the life out of the game.”

By the fourth quarter, the Celtics were out of kilter. Pierce sat down after picking up his fifth foul, and Allen missed an uncontested dunk. Glen Davis had a great chance at a garbage layup and couldn’t convert — Boston’s seventh consecutive missed field goal — then committed a frustration foul on the rebound.

“This should have been a game,” Pierce said, “where the starters should have been resting in the fourth quarter.”

Notes: The Wizards had a sellout for only the second time this season. A visit from Miami provided the other one. … Washington signed Shakur because Kirk Hinrich sprained his elbow Friday. Shakur’s No. 22 jersey looked as if the numbers had been sewn on at the last minute by someone’s mom — they weren’t in the same location as his teammates’ numbers. Hinrich will have an MRI to check for ligament damage. … O’Neal, injured in the first quarter of Friday night’s win over Utah, sat out his 10th game this season. Rivers said he’ll have an update on O’Neal when the Celtics resume practice Monday. “If it was something to be concerned about, I probably would have been told. So I’m just assuming that it’s nothing that bad,” Rivers said. Rookie Semih Erden started in place of O’Neal for the Celtics, who are missing Kendrick Perkins and Jermaine O’Neal with long-term injuries. … The Wizards played back-to-back games at home for the first time since November 2005.