Westwood, ranked No. 12 in the world, joins No. 1 Woods, No. 3 Rose and No. 23 Mahan as Foley's latest pupil, according to GolfWeek.
Westwood was looking "for a new set of eyes," according to GolfWeek, and found it in Foley, who has helped Woods win four times on the PGA Tour this season and Rose capture the U.S. Open in June.