Kim Si-woo has reached his new career-best No. 18 in the men's world golf rankings on the strength of his latest top-10 finish on the PGA Tour. Kim moved up a spot to No. 18 in the latest rankings announced following the conclusion of the Memorial Tournament at Muirfield Village Golf Club in Dublin, Ohio, on Sunday (local time). Kim shot a six-under 66 in the final round to finish tied for 10th at five-under 283. It was Kim's eighth top-10 finis…