 While a legitimate rivalry between Ethnikos and Olympiacos still exists in water polo (Ethnikos Piraeus Water Polo Club has won the most Greek water polo championships of any club, while Olympiacos Water Polo Club has won the second-most), that is no longer the case in football.Ethnikos and Olympiacos were more or less evenly matched and had great battles for Piraeus supremacy in the 1920s and 1930s, but thereafter Olympiacos became increasingly more powerful and successful; Ethnikos has not defeated Olympiacos in a league match since the 1985–86 season and has not finished above Olympiacos in the league standings since the 1987–88 season.A recent point of contention for Ethnikos fans has to do with Karaiskakis Stadium.