Allyson Felix won her 19th and final medal in the world championships Friday night -- a bronze she took after running the second leg of America's 4x400-meters in the mixed relay that's been touted as the last major race of the 36-year-old's career.
Allyson Felix won her 19th and final medal in the world championships Friday night -- a bronze she took after running the second leg of America's 4x400-meters in the mixed relay that's been touted as the last major race of the 36-year-old's career.