Maggert took the lead in the Charles Schwab Cup standings, 119 points ahead of Colin Montgomerie. Montgomerie skipped the tournament because of commitments in Europe.
Maggert finished at 14-under 202 at En-Joie. He won the Regions Tradition in May and the U.S. Senior Open in July, both major championships, and took the Shaw Charity Classic three weeks ago in Canada.
The Texan's second straight 68 on Saturday put him in good position for another win, and he took advantage in a big way with six birdies in a bogey-free round.Goydos shot a 68. Corey Pavin (69), David Frost (64), Peter Senior (65), Jerry Smith (67) and Ian Woosnam (70) tied for third at 10 under.
Bernhard Langer, the winner last year and third in the Schwab Cup, failed earn any points. He tied for 20th at 6 under after a 68.Lone Oak alum Kenny Perry finished tied for 58th at 1 over after a final round 72. Metropolis, IL native John Riegger fired a final round 71 and finished tied for 62nd at 2 over. Paducah's Russ Cochran withdrew after the first round.