Marko Vavic was born April 25, 1999, to father
Jovan Vavic, a water polo champion and coach, and Lisa Vavic in greater Los Angeles, California, growing up primarily in Rancho Palos Verdes. Vavic had dual citizenship with the U.S. and
Montenegro where his father was born. From an athletic family that greatly valued the sport of water polo, he was one of four siblings, with brother Nicola, Stefan, and sister Monica all playing water polo for USC, and his father serving as a coach. He attended
Loyola High School, an old, private, highly rated catholic college-prep school for boys in Los Angeles, where he competed in both swimming and water polo, and twice captured All-CIF honors as first team. He helped lead Loyola to the CIF semifinal championships in water polo in 2016 and 2015. As a swimmer, he was a California Interscholastic Champion in his Junior year, and placed second in his Senior year. As a water polo player, he was a Mission League Most Valuable player, and a Most Valuable Player on Defense. He was named an Athlete of the Year in 2017, while representing Loyola. In Club play, Vavic competed for the Trojan Water Polo Club. == University of Southern California ==