Dustin Johnson's chances of winning the U.S. Open disintegrated right before his eyes.
Johnson started the day with a three shot lead over Graeme McDowell but gave it all back at the 2010 U.S. Open (and then some) with a triple-bogey, double-bogey performance on holes two and three.
Don't think he is the biggest to blow leads in Major golf Championships...
Here are some of the best (or worst)...
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