Johnson shot a final-round 4-under-par 68 to capture the Monterey Peninsula Classic in Seaside, Ca. Perez, who led after 54 holes, shot a Sunday 77 to tie for third.
Johnson started the day birdie-bogey-bogey-birdie, but steadied himself with back-to-back birdies at the 7th and 8th holes. Johnson made the turn at 1-under-par for the tournament, and didn't look back. The Augusta, Ga. resident birdied the 12th and 16th holes to move to 3-under; and then, after a bogey at the par-3 17th, birdied the 72nd hole for a one-shot victory.
Only four players finished the tournament under par. Michael Allen finished in second place at 2-under, following a final-round 71. Perez and Tim Clark tied for third at 1-under.
Johnson held the 54-hole lead at the Ozarks Open in August, but carded a Sunday 76 to tie for 13th.
With the $81,000 first-place check, Johnson moves from 65th to 19th on the 2000 money list.