Currently, there are really few players playing this mode, so you can easily boost the 20 wins with friends: build 2 teams of 4 player each, choose Elimination as preference in the "deathmatch" menu (it is sufficient if it's done by the leader of each team) and then start searching for a match at the same time.
If the leaders of the two teams are from the same country, this will increase a lot the possibility for the matchmaking.
Important: if a team finds a random match, DON'T QUIT and finish the game, otherwise you will have to wait 15 minutes for penalty.