(CNN) -- World No. 3 Steve Stricker will take a six-shot lead into the final round of the Northern Trust Open after completing a five-under-par 66 on Sunday.
The American, who was runner-up to Phil Mickelson by one shot last year, had been five clear of the field with four holes left in his third round when bad weather again halted play on Saturday, leaving 41 players on the course.
The 42-year-old returned to the Riviera Country Club in rain-hit Pacific Palisades, California, and immediately picked up two birdies.
But a bogey at 18 took the gloss off what could have been an even bigger advantage as he missed the green and dropped his first shot in 32 holes, leaving him on 15-under 198.
World No. 2 Mickelson, seeking a record third successive victory at the tournament, on Saturday fell back to a tie for 19th on four-under 219 as he failed to capitalize on an eagle at his first hole. Bogeys at the par-four 10th and 15th saw him sign for a level 71.
Argentina's Andres Romero was tied for second after coming back to complete a 70, with a bogey and a birdie in his four holes on Sunday leaving him level with England's Luke Donald and American J.B. Holmes.
That pair had shared the clubhouse lead on Saturday evening, having completed rounds of 66 and 67 respectively.
Halfway leader Dustin Johnson parred four holes to complete his round and sign for a 74 to stabilize after a disappointing effort on Saturday, when he double-bogeyed the par-four third, dropped another shot at the next, and also bogeyed 11.
Johnson, who led Stricker by one shot after 36 holes, was tied for fifth on eight-under with fellow Americans George McNeill, who carded 66 on Saturday, and Kevin Stadler, who parred three holes to complete a 69 on Sunday.
U.S. Ryder Cup star Anthony Kim had also been chasing the leaders on Saturday with four birdies in 11 holes, but he dropped shots at 15 and 16 to be in a group tied for eighth on seven-under.
He stayed there after coming back to par 18 and sign for a 69 on Sunday to be level on 206 with compatriots Alex Prugh (66), Steve Marino (69) and Ricky Barnes (69).