Currently, there is no other way to find a particular game than to scroll through the pages of live matches one by one. People tend to prefer watching games with 10 players (no leavers) and I believe most people also prefer watching matches that have just begun.

I suggest allowing the player to change the order of the live matches in the Watch section by number of players (showing games with no leavers first) and/or by play time (showing the pre-game and most recent games first).