O'Neill, a hard throwing right hand pitcher and power hitter, will take her talent into the circle at Mercer University in Macon Georgia.
Constantin, a middle infielder who hits both for power and average, will grace the diamond at Central Connecticut State University next year.
For the last four years both girls have competed all over the USA while playing for Rhode Island Thunder Gold
The two seniors signed their National Letter of Intent Wednesday night at Extra Innings in Wrentham.