The phrase "dream matchup" refers to a perfect or highly desired pairing or competition between two individuals or teams that people have always wanted to see or experience. Full definition
He gets a veritable dream matchup against the Nets, who run the sixth - fastest pace and sport a bottom - third defensive efficiency. (si.com)
Altuve vs. Kershaw is some perfect dream matchup stuff, but Kershaw gets the best of the heart of the Astros in their first World Series meeting to complete a 1 -2-3 first. (sbnation.com)
So the stage is set and in all cases it seems like a dream matchup. (allsportsseries.com)