Northern Trust Open

Caddy Jim “Bones” MacKay gives Phil Mickelson a hug after closing out the victory Sunday in the Northern Trust Open at Riviera Country Club.   (Allen J. Schaben / Los Angeles Times)

Phil Mickelson became the seventh player to win back-to-back tournaments at Riviera Country Club after he closed with a one-over-par 72 on Sunday, good enough for a one-shot victory over Steve Stricker.  (Allen J. Schaben / Los Angeles Times)

Steve Stricker follows through on his drive at No. 17 Sunday, when he shot a final-round 67 at Riviera Country Club to put the pressure on Phil Mickelson before finishing second.   (Allen J. Schaben / Los Angeles Times)

Fred Couples contemplates his putt on the eighth green Sunday during the final round of the Northern Trust Open. The 49-year-old, a two-time winner at Riviera, would bogey the final hole for a 69 to fall into a three-way tie for third with K.J. Choi and Andres Romero.  (Allen J. Schaben / Los Angeles Times)

Fred Couples putts for par Sunday on the scenic 10th hole at Riviera Country Club during the final round of the Northern Trust Open.  (Allen J. Schaben / Los Angeles Times)

Andres Romero is disappointed with his approach shot on No. 8 at Riviera Country Club on Sunday during the final round of the Northern Trust Open. Romero shot one-under 70 on Sunday to finish tied for third with K.J. Choi and Fred Couples.   (Allen J. Schaben / Los Angeles Times)

Phil Mickelson chips onto the eighth green Sunday during the final round of the Northern Trust Open at Riviera Country Club.   (Allen J. Schaben / Los Angeles Times)

K.J. Choi, who tied for third place, reacts to the crowd’s roar ater his approach shot to the 18th green on Sunday, when he shot a final-round 69.  (Allen J. Schaben / Los Angeles Times)

Fred Couples, who is playing his last full season on the PGA Tour at the age of 49, watches his tee shot on No. 9 at Riviera Country Club on Sunday during the final round of the Northern Trust Open.  (Allen J. Schaben / Los Angeles Times)