Mumbai: Reliance (Raigad) topped the four-team invitational water-polo league with unblemished 3-0 record to win the GMAAA-MLWB 4-Team Invitational Water Polo League held at Maharashtra Labour Welfare Board’s swimming pool at Prabhadevi (Elphinstone Road), here on Monday. This was Reliance second title so far, having earlier won the YMCA Invitational league last month.