Scottie Scheffler won another tournament and solidified his No. 1 world ranking by shooting 2-over-par 74 on Sunday to win the Memorial Tournament in Dublin, Ohio. Scheffler held on to the lead despite challenges in tough final-round scoring conditions at Muirfield Village Golf Club. His 8-under 280 tournament total was good for a one-shot advantage on Collin Morikawa, who posted 71 on Sunday. It's Scheffler's fifth PGA Tour win this year, all since the beginning of March. The tournaments he's won are a sampling of the most prestigious on the PGA Tour: the Masters, the Players Championship and three signature events. The 27-year-old Texan will be one of the favorites at the U.S. Open this coming week at Pinehurst No. 2 in North Carolina. Canada's Adam Hadwin shot 7…