Roc Oliva Isern (born 18 July 1989), also known as "Metra", is a Spanish field hockey player who plays as a midfielder or forward for Real Club de Polo and the Spanish national team.
He played most of his career for Atlètic Terrassa HC but from the 2018-19 season onwards he played for Real Club de Polo.
His father Jordi and sister Georgina are also both Olympic hockey players.