Geslin missed the majority of the 2018-19 season with an injury as she completed just nine singles contests and eight doubles bouts.
The junior, seeded No. 11 in the B Singles main draw at the ITA Regionals hosted by Davenport University, reeled off four consecutive victories in the championship bracket.
Geslin defeated opponents in order from Lewis, Hillsdale, Maryville and Drury, before eventually falling to bracket champion Anna Valieava from UIndy.
Geslin was seeded 11th among 64 individuals in the B Singles bracket while advancing into the semifinals.