<prompt> Pedzisa mutsara unotevera: Nemhaka yenguva yezviitiko zvake zveGrand Prix, Mroz akanga ane bye ku  <response>: 2009 U.S. Championships. KuNational, Mroz akaiswa 4th muchirongwa chipfupi mushure mekunge apihwa mbiri yekumhara 3A sekusvetuka kwake kunodiwa uye 3Lz-3T sekusvetuka kwake kwakabatanidzwa. Akaiswa wechipiri muchikanda chemahara, umo akaverengerwa nekumhara 4T uye masere matatu, kusanganisira mubatanidzwa we3Lz-3T. Akakunda menduru yesirivha yose, achiisa 12.19 mapoinzi kumashure kwemukundi uye mudzidzi-mudzidzi Jeremy Abbott uye 0.60 mapoinzi pamberi paEvan Lysacek. 