Jon Rahm holds razor thin No. 1 margin over Collin Morikawa
over 3 years in irish sun
Jon Rahm retained his spot atop the Official World Golf Ranking this week, but the Spaniard's grip on No. 1 is precariously thin.
Collin Morikawa entered The Genesis Invitational with his third opportunity to claim the top spot for the first time in his career. Morikawa, who also had mathematical chances to claim No. 1 at the Hero World Challenge and the Tournament of Champions, needed to win on Sunday and have Rahm fini
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