Mickelson came to the Masters for the first time without having finished in the top five all year .
He looked as comfortable as ever , particularly on the back nine with an eagle - birdie - birdie stretch that put him atop the leaderboard at 67 .
Mickelson came to the Masters for the first time without having finished in the top five all year , but he looked as comfortable as ever , particularly on the back nine with an eagle - birdie - birdie stretch that put him atop the leaderboard at 67 .