LOS ANGELES — Nineteen golfers, including the Genesis Open’s nonplaying host, Tiger Woods, have ascended to the men’s world No. 1 spot since the rankings were introduced in 1986. On Monday, Dustin Johnson will become the 20th.
Johnson, the reigning United States Open champion and PGA Tour Player of the Year, closed with rounds of seven-under-par 64 and 71 at a soggy Riviera Country Club on Sunday for a five-stroke victory. The win will vault him past Jason Day, the No. 1 player for the past 47 weeks and for 51 weeks over all, and the former No.