(CNN) -- The secret to Phil Mickelson's recent successes against longtime rival Tiger Woods could lie with the man who has coached both golf superstars -- Butch Harmon. Harmon helped Woods to eight of his 14 major triumphs between 1993 and 2004, and started working with Mickelson three years later. He was on hand to give the veteran left-hander tips during the pair's final-round showdown at Pebble Beach on Sunday. Mickelson bettered his fellow American for the fifth time in a row when they have played together on the last day of a tournament to clinch his 40th PGA Tour title.
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Tiger Woods' ex-coach Butch Harmon gave Phil Mickelson tips on how to beat him
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Harmon worked with Woods for eight of his 14 major triumphs between 1993 and 2004
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The coach has been working with four-time major winner Mickelson since 2007
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Mickelson has bettered Woods eight times since working with Harmon
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