Tiger Woods wants Grand Slam, starting with Masters in Augusta

Four-time Masters champion Tiger Woods says it's possible that he could win the Grand Slam, all four major golf championships, this year.

"I've done it before; I've won all four in a row," Woods told reporters at the Augusta National Golf Club on Tuesday. "Majority of my career, I think this is my 12th or 13th season out here, and nine of those years I've won five or more tournaments, so just got to win the right four."

But the championships are all in the same calendar year this time, and the Masters is the first tournament.

Two-time champion Phil Mickelson says it's not impossible, but he's skeptical.

"I think that's the most difficult feat in golf," said Mickelson. "I think it'd be pretty cool to see it done. The last tournament or two there would be some incredible pressure."

The defending champion, Zach Johnson, is not concentrating so much on the Grand Slam.

"If it even crossed my mind, and I can't recall if it did...it was in my mind briefly," said Johnson. "I'm pretty realistic about things."

Johnson won the Masters in 2007.

Tournament play starts Thursday.

The competitors played practice rounds on Monday and Tuesday.