American sprinters Carmelita Jeter and Walter Dix will both race at the annual Rafer Johnson/Jackie Joyner Kersee Invitational, which takes place from Apr. 12-14 in Drake Stadium. Jeter, the world 100m champion from last summer, has been in fine form in the last few seasons and will be using the meet as one of her preparations for the upcoming Olympic Games in London, later on this year. Meanwhile,...