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A six-day fast helped Phil Mickelson drop 15 pounds ahead of the Open Championship.

The 49-year-old said in a video posted to his Twitter feed that he wanted to do everything possible to be his best at Royal Portrush, site of the 2019 Open Championship this week. That included a six-day fast during which he allowed himself only a special coffee blend for nutrition and water.

Let’s get real for a minute. I haven’t been my best and I’m doing all I can to get it right. I’ll have more Phireside chats soon as well as a fun new series too. Until then, HIT 💣’s pic.twitter.com/QrqUpThEeV

— Phil Mickelson (@PhilMickelson) July 14, 2019

“I haven’t been my best and I’m doing all I can to get it right,” Mickelson said.

Mickelson has not posted a top-15 finish since winning at Pebble Beach in February. Since tying for 18th at The Masters, he has missed the cut in four of his last six tournaments.

Mickelson won The Open at Muirfield in 2013 and has been preparing for this week’s challenges on and off the course.

“The last 10 days I’ve done what I call a hard reset to change and try and make things better,” he said.

–Field Level Media (@FieldLevelMedia)