O’Connor played either shortstop or second base in every Rider baseball game for three consecutive years before signing a professional contract with the San Francisco Giants. A two-time team MVP, O’Connor set team single-season records for double plays, runs scored, doubles and runs batted in, and left as the Rider career leader in hits (132 in 104 games), batting average (.338) and RBI (93), and was second in career runs (93).