Article Photos: Thunder report card: An ‘F' for starting halves; A ‘B' for defending Dirk Nowitzki 19/106

Dirk Nowitzki (41) of Dallas puts up a shot over Oklahoma City's Kendrick Perkins (5) during game 3 of the Western Conference Finals of the NBA basketball playoffs between the Dallas Mavericks and the Oklahoma City Thunder at the OKC Arena in downtown Oklahoma City, Saturday, May 21, 2011. Photo by Chris Landsberger, The Oklahoman