<prompt> Pedzisa mutsara unotevera: London 2012 middleweight champion Claressa Shields akanga ari US mukadzi mutambi wetsiva kukwidziridza nzvimbo yake yeOlympic nekukunda kwequarterfinal pa  <response>: Makwikwi Enyika muAstana, Kazakhstan. Antonio Vargas naGary Antuanne Russell ndivo chete vanhu vekuAmerica vakawana nzvimbo dzekuwedzera muchikwata chebhokisi pa2016 AIBA World Qualifying Tournament muBaku, Azerbaijan. 