Even a Three-Time Masters Champion Can Make Some Mistakes He’d Like to Forget

A Phil Mickelson whiff leads to a triple bogey; both he and Tiger Woods solidified with their third-round performances that they won’t be in contention this time

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AUGUSTA, Ga.—With one swing Saturday, all the duffers in the world had the proof they needed: Even one of the best golfers in the world can swing—and completely miss.

And unlike most of you: Phil Mickelson followed the rules and took a stroke on it.

Mickelson, a three-time champion here at the Masters, began his third round with a tee shot...