Callahan added four steals while Tarrant had five assists. Josh Davis had 11 points and eight rebounds for the Green Wave (7-2).
Freshman T.J. Carpenter notched a career-high 15 points for the Colonels (1-4).
The win makes Tulane 4-0 on its current homestand, and the Green Wave has now won 19 of 20 all-time showdowns with Nicholls State.
Tulane led 23-12 with just under 8 minutes left in the first half, but the Colonels cut the lead to 30-24 by halftime.
Callahan hit a 3 then Davis made a dunk and two free throws to put Tulane up 37-24 after the break. Nicholls State never pulled closer than eight after that.
ESPN's Dan Dakich joins The Paul Finebaum Show to discuss the SEC's presence in the NBA Draft.
Ted Kapita was the top-rated recruit from West Virginia in the class of 2015 and recently played at DME Academy in Florida.
With the Suns drafting Tyler Ulis, they now have five guards on their roster who attended Kentucky.
|Stephen F. Austin||18-0||-||28-6|
|Sam Houston State||12-6||6||18-16|