Kuchar improved to 2-0 in playoffs and won the top prize of $1.08 million, boosting his earnings for the year over $2 million.
Tied for the lead after 72 holes, neither player managed to win after two holes of a sudden-death playoff Sunday. They birdied the first extra hole, parred the second before play was suspended because of darkness.
Playing the 12th, 13th and 18th holes in the playoff, Kuchar missed a chance to end it on the first hole Monday when he missed a 4-foot putt at the par-4 13th hole as each player bogeyed the hole.
They matched each other on the next two holes, then Kuchar got a huge break when Taylor hit his tee shot at No. 13 into the water hazard along the right side of the fairway.
Kuchar hit his second shot into the rough on a slope to the right of the green, pitched to inside 2 feet for the victory as Taylor made double bogey.
It was the second career victory for Kuchar, who won the 2002 Honda Classic. His best previous finish this year was a fifth-place tie at the Memorial in June.