Article Photos: Thunder notebook: Kendrick Perkins, Tony Allen have unpleasant exchange 13/77

Oklahoma City's Russell Westbrook (0) and Serge Ibaka (9) hang their heads as they walk off the court late in the fourth quarter of the 114-101 loss to Memphis during game one of the Western Conference semifinals between the Memphis Grizzlies and the Oklahoma City Thunder in the NBA basketball playoffs at Oklahoma City Arena in Oklahoma City, Sunday, May 1, 2011. Photo by Chris Landsberger, The Oklahoman