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It's the second-straight time he crumbled on Sunday at a major. He shot a 75 in the final round of the British Open to choke away a two-stroke lead.
Last night, after Jason Dufner won the PGA, Westwood went on a bizarre, sometimes-NSFW Twitter meltdown that lasted three hours.
He called his haters "girly boy trolls" and told people to get a life. At the end of it all he confirmed that he wasn't hacked, closing with, "Westy out."
Here's a sampling of what he tweeted:
Perhaps this is a clue to what motivated the outburst: