Homerun Clash: Legends Derby puts fair competition and quick matching for all players as its top priority.
To achieve this, The matchmaking system for 1vs1 Match looks for players who have unlocked the same stadium and have made similar progress (in this case, Trophies) as quickly as possible.

[1vs1 Match Matchmaking]
In 1vs1 Match, the system searches for an opponent who has unlocked the same stadium as the player.
However, even if two players have the same stadium unlocked, the matchmaking priorities may differ depending on the number of Trophies and if the same-level players are not available, resulting in matching with an opponent who may be tougher or easier to play against.
Players with different unlocked stadiums do not match.