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I Just used the Selection tool (I think you can use it by pressing W) And i wanted to just sperate the background from the players in order to add some effects to the background without effecting the players...
Too many pixels were selected and it left behind a softened edge. You can open the original image back into this document and place it below the players that you have placed on their own layer.
You should never work on the original layer, always make duplicate. Also, when you make a selection, use a layer mask or use Cmd/Cntrl + J to copy the selection to its own layer.......this will leave the layer it's copied from intact.