Hey, suggest following:
change current 1vs1 into:
1vs1 with Player queue up to 8 Players.
Winning Player stay and the loser will replaced by the next in the queue, he last player who has losed will placed at the end to the queue.
Would be an overall improvement to the 1vs1 feeling. The most simple left after first match. With this solution players will always "refilled" to a current running 1vs1 match.