Gabby was born in Quezon City, Philippines. He started learning tennis early when he was 5 years old. Gabby was nationally ranked #1 in the 10s, 12s, 14s, 16s and 18s in the Philippines. He represented his school, University of Santo Tomas, Manila from 1997-2002 and was awarded Most Valuable Player UAAP season 2001-2002.Gabby was the head coach of grade, middle and high school teams of International School of Manila from 2004-2010, University of the Philippines Womens Tennis Team 2008-2011 and University of Santo Tomas Mens Tennis Team 2011-2013. He’s worked with Aussie legends John Newcombe and Roy Emerson at John Newcombe Tennis Ranch, New Braunfels, TX, USA in 2007. Gabby is currently the Head Coach at Tanglin Trust School.