Spain(U21) now sit 3rd in the group. Facing the leaders Poland(U21), Spain(U21) are motivated to win this match, in order to have a chance of progressing into next stage.
As for Poland(U21), they are now the group leaders. They are able to win this group as long as they grab 1 point in this match. So they are also motivated.
However, Spain(U21) are superior by grabbing 4 wins and 1 loss in their last 5 games against Poland(U21). Besides, now the AH line is -1.75 for Spain(U21), which is fully in favor of them.
In conclusion, the AH favorites Spain(U21) should be supported in this match.