Mike Conley hit two free throws with 1.1 seconds left in overtime, and the Memphis Grizzlies moved up from the eighth seed by edging the Dallas Mavericks 106-105 on Wednesday night.
Memphis became the seventh team in the West with 50 wins this season with the victory.
The Grizzlies, who set a franchise record with a 14th straight home win in a single season, will open the postseason Saturday night at Oklahoma City.
Zach Randolph led Memphis with 27 points and 14 rebounds, and Marc Gasol had 19 points, shooting 9 of 13. He also had nine rebounds and nine assists.
Dirk Nowitzki led the Mavericks with 30 points.