Golf: Mathis leads St Jude Classic as Westwood trails behind
Mathis birdied three of the first five holes on the front nine to get off to a flying start, before making bogey on the par-three eighth. The 37-year-old also picked up three more shots on the back nine to finish top of the leaderboard on five under.
Westwood was one under for the day after losing a shot on the third hole before putting together a run of three birdies in four holes on the back nine.
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Hide AdFive players were tied for a share of second after rounds of 66.
Sweden's Robert Karlsson was the only non-American among the group, which included John Merrick, Kris Blanks, Kevin Kisner and Colt Knost. Keegan Bradley and Argentina's Fabian Gomez were next on three under, while a pack of ten were one shot back.
Spain's Sergio Garcia was poor throughout and signed for an eight-over par 78.