    Sentence 1: At best , Davydenko 's supporters  were naively ignorant of tennis etiquette ; at  worst , they cheated - yet went without penality  from umpire Lars Graf .    Sentence 2: At best , Davydenko 's supporters  were naively ignorant to tennis etiquette ; at  worst , they cheated ~ yet went unpenalised by  umpire Lars Graf.