Brooks Koepka of the US reacts after winning putt on the eighteenth hole during the final round of the CJ Cup golf tournament at Nine Bridges golf club in Jeju Island on October 21, 2018. Triple major champion Brooks Koepka will overtake Dustin Johnson and Justin Rose to become world number one for the first time after winning the CJ Cup on October 21, by four strokes. / AFP / Jung Yeon-je
Brooks Koepka celebrates his victory in South Korea. AFP

Brooks Koepka to be new world No 1 after victory in South Korea