To be eligible for the award, a player cannot have played any more than 25 games previously in any single season, nor have played in more than six games in two separate preceding seasons in any major professional league. The latter fact was perhaps most prominent when in 1979–80, first-year phenom Wayne Gretzky was not eligible to win the Calder Trophy despite scoring 137 points (the previous rookie record at the time being 95), due to him playing a full season the previous year in the World Hockey Association. The trophy has been won the most times by rookies from the Toronto Maple Leafs, who have won it on nine occasions.