I know it was a big meltdown guy and I agree, but come on: "The Farmers Open"?
How about Phil Michelson's melt down at the 2006 U.S. Open at Wingfoot? As I mentioned, that immediatley comes to my mind when someone mentions blown tournaments.
At the 2006 U.S. Open at Winged Foot, Mickelson was part of a wild finish, in which he ended up in a tie for second place at +6 (286), one shot behind champion Geoff Ogilvy. On the 71st hole, Mickelson, with the lead at +3, missed the fairway to the left, and his drive finished inside a garbage can, from which he was granted a free drop; he parred the hole, but his bogey on the previous hole reduced his lead to one shot heading to the final hole. Needing a par for a one-shot victory, he chose to hit driver on the final hole of the tournament, and hit it well left of the fairway (he had only hit two of thirteen fairways previously in the round). The ball bounced off a corporate hospitality tent and settled in an area of trampled-down grass that was enclosed with trees. He decided to go for the green with his second shot, rather than play it safe and pitch out into the fairway. His ball then hit a tree, and did not advance more than 50 yards. His next shot plugged into the left greenside bunker. He was unable to get up and down from there, resulting in a double bogey, and costing him a chance of winning the championship outright or getting into a playoff, and also ending his bid to join Ben Hogan and Tiger Woods as the only players to win three consecutive professional majors (he had won two in a row heading into Winged Foot).
a