Dirk Nowitzki, Mavs end Suns' chances for playoffsDirk Nowitzki scored 19 points, including the go-ahead basket and a key three-pointer in the fourth quarter, and the Mavericks eliminated the Phoenix Suns from playoff contention with a 107-104 victory in Dallas on Wednesday night.Phoenix will miss the postseason for the fifth straight season because it can finish no better than a tie with New Orleans and Oklahoma City for the final spot in the Western Conference.Zach Randolph had 15 points, 13 rebounds and six assists as host Memphis dropped New Orleans back into a tie with Oklahoma City for the West's final playoff spot.LaMarcus Aldridge had 24 points and 13 rebounds before sitting out the fourth quarter as host Portland won in a rout. ...Robin Lopez added 18 points for the Blazers, who have won the Northwest Division title but continue to fight for homecourt advantage in the playoffs with four games left.LeBron James scored 21 points with nine rebounds and eight assists for the Cavs, including 10 points in the fourth quarter.Victor Oladipo had 23 points and scored on a layup with 1.5 seconds left as host Orlando spoiled Derrick Rose's return to the Chicago lineup. ...Lou...