Swiss perfection too much for American curling duo

In a sport known for politeness, the sight of American curlers Matt and Becca Hamilton banging their brooms against the Olympic ice in frustration was a rarity. But then so was the manner in which they lost the game.

Despite holding a 4-3 lead heading into the final end, or round, of curling’s mixed-doubles match Friday, the United States lost 9-4 to reigning world champion Switzerland after the Swiss managed something exceedingly unusual: a perfect score known as a six-ender. How rare is a six-ender? Think of it as a hole-in-one in golfing, or a perfect game in baseball.