[1][2][3][4] In 2015, UTRGV entered into operation after the merger of UTPA with the nearby University of Texas at Brownsville.

The UTPA athletic program was inherited by UTRGV, and Mantrana kept his position through the merger.

He then became the women's golf temporary head coach for UTRGV in the fall of 2017.

On May 24, 2017, he announced that he was stepping down as coach, with Mantrana being tapped to serve as a special assistant to the director of athletics.

He then transferred to Middle Georgia, where he helped the Warriors to the 1983 NJCAA World Series.