The Ants are in the playoffs for the first time in the franchise's six years in the league.
Eight of the D-League's 16 teams make the playoffs. Division winners Bakersfield, Rio Grande Valley and Canton will choose their first-round playoff opponents from among the four wild-card teams with the worst records.
Considering their strong finish the Ants may end up not being chosen to play a division winner and could face top wild-card team Santa Cruz in the first round. The higher seeded team hosts Game 2 and 3 (if necessary) in the best-of-three series.
Tony Mitchell led the Ants in scoring again Saturday night with 31 points, but hit only 13 of 34 shots from the field. Sadiel Rojas and Chris Porter added 13 apiece, Tommy Smith scored 11 and Terrance Thomas 10. Porter led the team with eight rebounds.
Tulsa (27-23) outscored the Ants in every quarter.
Former Indiana Tech player Rodney Bartholomew was a perfect 10-for-10 from the field to lead the 66ers with 21 points.