Brooks Koepka became the number one golfer in the world after achieving a four-stroke victory in the CJ Cup at Nine Bridges.
Koepka dethroned American Dustin Johnson at the top of the world ranking by claiming the championship after eight par 64 in South Korea on Sunday.
Three-time senior champion Koepka had never topped the ranking, but that changed on Jeju Island, where he finished 21st for his third win in 11 starts and the fifth PGA Tour title overall.  Koepka reached the final round with a four shot advantage and maintained that advantage, crowning his victory with an eagle on the 72nd hole. The new number one recorded a 29th return.
The twice prevalent in the USA. UU The owner of the Open had an eagle, eight birds and two bogeys to finish away from compatriot Gary Woodland.
Woodland fired a final round of 63 to win the runner-up check, ahead of Ryan Palmer (62) and Rafa Cabrera Bello (65).
Former world number one Jason Day (67) closed the tournament tied for fifth with Scott Piercy (69) on 12 under.
American star Justin Thomas had 16 strokes of the pace after his four under par 68.