Matt Kuchar has recorded his second successive round of 66 to move to the top of the leaderboard at the Memorial Tournament.
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The world number 18 hit seven birdies and dropped just one shot as he secured a share of the lead alongside compatriot Brendan Steele.
The pair are one shot ahead of Emiliano Grillo and Gary Woodland while a group of four players - including first-round leader Dustin Johnson - sit three shots off the lead in a share of fifth place.
World number one Jason Day is 12th after a disappointing round of 71, where he is joined by Rory McIlroy who bounced back from a poor first round to shoot a score of 66.
Jordan Spieth lies a shot further adrift of his two main rivals in a tie for 22nd position.