Sounds like you could leverage an INDEX MATCH here (based on your description, I can't see the screenshot).
If I understand correctly, though, you have the rank listed in Col I, and the score in Col C.
=INDEX(C$1:C$20,MATCH(1,I$1:I$20,0))
That will figure out how far down the list rank 1 is, and then go that far down Col C and return the value.