UsainBolt'sdecisiontocalltimeonhisglitteringcareerwilldominatetheIAAFWorldChampionshipsinLondonthatstartsFriday.Jamaica'sUsainBoltcelebrateswithfansafterwinning
Olympic400-meterchampionWaydevanNiekerkranaworld-leadingtimeof43.62secondsonThursdayinhisfirstmajorraceathisfavoreddistancesincetheRiodeJaneiroGames.VanNiekerkc
SouthAfrica'sWaydeVanNiekerkandShaunaeMiller-UibooftheBahamaseachcapturedtheir200metreracesontheseconddayofatrackandfieldeventinBostononSunday.The24-year-oldVan