world war (vs german empire)
another world war (vs nazi germany)
world cup final (vs west germany)
competition to not finish bottom of the group because south korea (vs germany germany)
You cheated and "won" against the Federal Republic of Germany in '66. We're still exactly that. And we've had that discussion now three or four times. We annexed the commies. Not formed a new nation.
We could go with DEUTSCHLAND!!!! tbh. The tried and tested Deutschland is fine, but a bit unspectacular, and if there's anything that Germans are known for, it's spectacularness.