Locsin, a standout softball player for Pace, was a four-time NE10 All-Conference selection during her playing days. In 2004, she became the first softball athlete to win both Player and Pitcher of the Year in the same season – a feat that has been repeated just twice ever since. She was also named NE10 Freshman of the Year in 2002, as well as a First Team selection on the NFCA Northeast Region Team.
Her career record in the circle was 78-31 (.716) with a 1.23 ERA, good for 13th on the all-time list among NE10 pitchers. Her 78 victories are second-best in league history, while her 768.0 innings pitched rank third. At the plate, Locsin hit .331 (126-for-381) for her career with 22 home runs and 99 RBI.