Sycamores coach Greg Lansing needs two more wins to become the sixth head coach in school history with at least 100 victories.
Matt Van Scyoc scored 20 points on 8-of-8 shooting, including all four of his four 3-point attempts, for Indiana State (4-6). Everett Clemons had five assists and grabbed 11 rebounds, and the Sycamores outrebounded the Prairie Stars 49-29, scoring 11 second-chance points on 12 offensive rebounds.
Up 36-27 at halftime, Van Scyoc hit back-to-back 3s and the Sycamores pulled ahead 46-31 and later went on a 10-4 run. Brenton Scott kicked off a 13-3 run with two free throws and a 3-pointer and Indiana State was up 73-57 with 2:02 left.
Indiana State shot 9 of 20 (45 percent) from beyond the 3-point arc.
Richard Freeman led Illinois-Springfield with 11 points.