Mattessich provided the inspiration for a lacrosse player depicted on a 51-cent Canadian stamp issued in 2006 in commemoration of the World Lacrosse Championship.
Edgeley Park was the venue for the final of the 1978 World Lacrosse Championship.
In that final year, he led Team Canada to a historic 15-10 victory over the United States in the 2006 World Lacrosse Championship, his last ever international game.
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He helped Canada win the 2006 World Lacrosse Championship, the country's first world championship since 1978, by scoring four goals in the final against the United States.
In 2006, Grant along with Gary Gait led the Canadian national lacrosse team to an historic victory in the ILF World Lacrosse Championships, with Grant leading the tournament in points and assists, and earning All-World selection.
It sends representative teams to participate in the Men's World Lacrosse Championship and the Women's Lacrosse World Cup.
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In the Men's 2006 World Lacrosse Championship, the national team placed eleventh out of twenty-one competing countries, and at the 2005 Women's World Cup, the national women's team placed seventh out of ten countries.
In 2008, the ILF merged with the former governing body for women's lacrosse, the International Federation of Women's Lacrosse Associations (IFWLA), to form the Federation of International Lacrosse (FIL).
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2006 Warrior World Lacrosse Championship, held in London, Ontario from 13–22 July 2006, was won by Canada and featured a record twenty-one competing nations.
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The championship game was won 15–10 by the Canadians over the United States in front of 7,735 fans and marked only the second loss by the Americans since the championship were founded in 1967, after Canada's historic 17–16 overtime win in the 1978 final at Edgeley Park, Stockport.
The 2011 FIL Women's U-19 World Lacrosse Championship is the 5th FIL Women's Under-19 World Lacrosse Championship, an international field lacrosse tournament that is held every four years and is sponsored by the Federation of International Lacrosse.