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Sue Ogrocki, Associated Press
Oklahoma City Thunder guard Russell Westbrook, bottom, releases a shot in front of Detroit Pistons center Greg Monroe, top, in the second quarter of an NBA basketball game in Oklahoma City,Monday, Jan. 23, 2012.

OKLAHOMA CITY — Russell Westbrook and reserve James Harden each scored 24 points, Kevin Durant added 20 and the Oklahoma City Thunder beat the Detroit Pistons 99-79 Monday night for their fourth straight blowout win at home.

The Thunder built up a 30-point lead midway through the second quarter and Detroit got no closer than 17 after the opening period.

Oklahoma City's starters had sat out all of the fourth quarter in the previous three games at Chesapeake Energy Arena and that streak was only stopped because Serge Ibaka replaced an injured Nick Collison with the rest of the backups.

Collison sprained his left ankle and didn't play after halftime.

Rookie Brandon Knight led Detroit with 13 points. Rodney Stuckey and Greg Monroe added 12 apiece.