Frances Tiafoe is working it — both on and off the tennis court! The 19-year-old Hyattsville, Md., native has won just two of nine matches on the ATP World Tour this season, yet he has soared 45 spots in the men’s singles rankings. As of June 19, Tiafoe was perched at No. 63, his highest rank … More Tiafoe continues to rise, shine as ATP pro