Article Photos: OKC Thunder: Sweeping the champs is nice, but tougher challenges are ahead 2/31

Oklahoma City's Serge Ibaka (9) blocks the shot of Dallas' Dirk Nowitzki (41) during Game 4 of the first round in the NBA playoffs between the Oklahoma City Thunder and the Dallas Mavericks at American Airlines Center in Dallas, Saturday, May 5, 2012. Photo by Bryan Terry, The Oklahoman