 Under Kásás guidance in 2001–02 Olympiacos had the most successful season in their history.They became the first club ever in water polo history (since the establishment of the modern Champions League format in 1996) to win four out of four competitions in a single year, thus completing the Continental Quadruple, comprising the Triple Crown (LEN Champions League, Greek Championship, Greek Cup) and the LEN Super Cup.They won both the 2002 LEN Champions League and the 2002 LEN Super Cup in Budapest, beating home teams Honvéd and Vasas respectively.