Why can't I get S Rank with a 26/1/42 score? Really???

I played {{champion:99}} and went 26/1/42 and didn't get an S..... I mean wtf??? did my 1 death cost me a S? Am I missing something here This is not the first time I have gotten a really good score and no S _ **Edit: Note this was ARAM**_ [[IMG]http://i63.tinypic.com/2dij0q1.jpg[/IMG]]
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