For shock value, if Wales beat England it will be a bigger upset than Leicester winning the Premier League.
On paper, there should be no chance. But at this World Cup, we've already seen Saudi Arabia stun Argentina, Japan beat Germany and Morocco turn over Belgium, so we can't take anything for granted.
Let's get real: Wales need a miracle to go through. But although it's a long shot, it's not totally out of the question that they could could beat England narrowly with Iran and the USA drawing to leave the door slightly ajar.