USA unbeaten at World Mixed Doubles Curling Championship
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The United States has a perfect record of four wins and zero losses at the 2017 World Mixed Doubles Curling Championship in Lethbridge, Alberta, Canada as of Tuesday afternoon. After their first four games, the Americans have beaten teams from Kazakhstan, England, Turkey and Germany. 

The American duo of Matt Hamilton of Madison, Wisconsin and Becca Hamilton of McFarland, Wisconsin have trounced their competition. They have beaten Kazakhstan 13-1, England 7-2, Turkey 13-3 and Germany 10-1 so far. 

The United States is one of six nations with an undefeated record so far. It is  joined by Latvia, Scotland, South Korea, the Czech Republic, Switzerland and the Czech Republic. The Czechs are in group D with the Americans. The United States still has to play the Czechs and Team Canada in the round robin. Canada is represented by Joanne Courtney of Edmonton, Alberta (who was the second for Rachel Homan in Canada's gold medal winning team at the World Women's Curling Championship) and Canada Cup champion Reid Carruthers of Winnipeg. The United States game against Canada can be seen on ESPN3 at 4:30 p.m. ET on Thursday. 

The 2017 World Mixed Doubles Curling Championship has significance because it is the last world championship in mixed doubles curling before it makes its Olympic debut at the 2018 Olympic Winter Games in Pyeongchang