Undoubtedly, Pick a good deck before joining Tournaments. Play warm-up games with your friends or via the matchmaking system. Also, it’s better to stick with only one during the Tourney. It is much easier to win If you have a great rhythm built up with the deck you are playing.
If you lose, take a short break to relax and cool off. Searching for battle immediately after a frustrating loss will make your Tourney performance collapse quickly. Take a minute to relax after a close win. If you continuouslyplay the game during several hours, you will find it very tired. The most mentally demanding games are those close ones.
Try to remember the amount of damage your Spells does to Towers. If you can’t remember, hold your finger on the spell for a few seconds and its damage will show up. Lots of players try to play defensively at the end in order to finish off the decisive Tower. This is very important.
Because of the incredibly extended overtime, Tower HP is much more value than in normal battles. Think twice before giving up your Tower HP.
Keep the mental note of your opponent’s played cards as well as the cards your opponent is still hiding. Try to find out his deck. If your opponent tries to hide something before the x2 Elixir time, it should be either Golem, Lava Hound, P.E.K.K.A, 3 Musketeers or Balloon.
Keep an eye on the timer. By doing this, sometimes you can play double pressure when it’s the right time, and still have enough Elixir to defend!
Once your opponent’s first Tower is destroyed, try to play defensively. Defending is not really hard at all since you control 3/5 the map now.
If your opponent has a weakened Tower which can be destroyed by your spells, start pushing on the other lane! Don’t finish it off too soon otherwise the opponent King’s Tower will join the game. Take the advantage of this!
Your first games will be usually the easiest ones, especially If you have Tournament level cards (Commons lvl 9, Rares lvl 7,…) and the battles will be very hard once you have 2-3 wins. The environment of Tourney is extremely competitive, so, prepare yourself!
Tournament games have lots of pressures, much more than the normal ones. Your opponents are more likely to make mistakes they wouldn’t many while playing ladder games. That’s great If you can use this pressure to your advantages, do everything to make your opponent uncomfortable (no, don’t use Taunts). Play the mind game by hiding your key card, not playing card in a certain order and mixing your playstyle.