* Overnight leader Oosthuizen finishes two shots back * Mickelson finishes in a tie for fourth place (Adds details, quotes) April 1 (Reuters) – American Hunter Mahan became the firstgolfer to record multiple wins on the PGA Tour this year byclaiming a one-stroke victory over Sweden’s Carl Pettersson atthe Houston Open in Humble, Texas, on Sunday. Mahan, who won the WGC-Accenture Match Play Championship inFebruary, shot a one-under-par 71 in Sunday’s final round atRedstone for a 16-under-par total of 272 in the last eventbefore the U.S. Masters
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UPDATE 2-Golf-American Mahan wins Houston Open by one shot