(AP) -- Chris Riley and Rory McIlroy share the lead at 6-under in the opening round of The Memorial.
Chris DiMarco and Josh Teater are next at minus-5 after signing for 67's on the Muirfield Village course in Dublin, Ohio
Luke Donald carded a 2-under-70 as golf's new No. 1 player.
His round included a double-bogey on his first hole and then a run of four straight birdies late.
Playing in his first event since finishing 33rd in the Masters, Phil Mickelson shot an even par 72.
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