The Demons (14-24), whose skid stretched to seven games, were within 5-3 before Tulane (27-14) regained command while cracking 14 hits against five NSU hurlers. The visitors collected nine hits, three by shortstop Mitch Huckabay, but left five on base in the fifth and sixth innings while on the verge of taking the lead.
Northwestern is home Wednesday evening at 6:30 to play host to Louisiana-Monroe, then hosts Southeastern Louisiana Friday night, Saturday and Sunday in a Southland Conference series at Brown-Stroud Field.
A walk and three singles, the last by Schneeberger, chased NSU starter Jacob Roark (2-4) to open the third inning, capped by an RBI double from Blake Crohan for a 4-0 advantage.
Drew Helenihi led off the fourth with a single, stole second and scored on a Colin Bear grounder to get the Demons on the board. Nick Purdy opened the next inning with a double and scored on Will Watson's base hit. Singles by Matt Burns and Huckabay gave Helenihi the chance for a run-scoring grounder plating Watson to draw NSU within 4-3.
The Green Wave answered in its half of the fifth on an RBI single by Tucker Oakley, then padded the lead in the sixth when Schneeberger singled, stole second, and scored on a base hit from Jeremy Schaffer for a 6-3 advantage.
In the pivotal bottom of the seventh, Tulane took advantage of a hit batsman, four walks (two with the bases full) and an error to push across three unearned runs with only two hits while making it 10-3. Alex Byo (6-3) worked the first six innings and evaded a big inning by NSU to pick up the win. The visitors didn't threaten after leaving the bases loaded with no damage in the sixth, Byo's last frame.