How do you improve your mental game in general and in tournaments?

Play point by point. Forget the previous point. Each point is a new point to win.

I think ask yourself why? Is it because you think you should be winning against those players, but when they make the points or when you make the mistake you get angry? 90% of the mental issues in amateur is all about ego. We think we are better than we are, we underestimate opponents, and when we lose games we shouldnt that is where our ego kicks and takes over. For me, I used to think I am better than this person so I should win. When they are ahead, this is where the ego kicks in and takes over. The way it changed, every game is a clean slate no matter who your opponent is. Don't coach your partner, but motivate. Stay positive, reset. If you feel negative, try to reset off court before getting into the court. Talk about it to your partner.

Nothing more annoying than having a partner that wants to coach your every move tbh

Have a plan. Train for it. Execute it the best you can. Adjust when necessary. Keep practicing. Visualize the game you want to play.

Brad Gilbert wrote a book called Winning Ugly, it’s a good read on the mental side of the game. It sits nicely alongside The Inner Game of Tennis, another recommended book.

Through the game you should not coach your partner, at this level, confidence is all, doesn't matter if you are playing in x or y way. Just make your partner feel as if they were prime Ale Galan, that's the smartest way to make your partner get more confidence and play better. Once they are in that state you can suggest some tactical changes, but always talking about both, don't say "You should try playing more lobs", instead say "Let's try to play more lobs", don't make your partner feel as if he is the problem. Tecnical tips are a NO GO, you won't correct someone techique during a fking competitive match, that is the dumbest thing ever, it's basically imposible to fix something techincal during a game, those things you leave to say in a practice day where your partner have space to try and make mistakes.

Es cuestión de estar constantemente concentrado y pensar que el punto perdido ya pasó y vale lo mismo (en papel) que el próximo que lo puedes ganar jugando tranquilo. No es tan sencillo, pero con algo de tiempo con este mindset y concentración, se logra.

In the grand scheme of things you are most likely a very average player, nothing special at all. The tournament you are entering most likely means nothing at all. That's how I view my tournaments and I play the same as I do in my normal matches.

I am a very competitive person and my usual partner is a woman. When we miss points, we usually laugh about it because we know we made a mistake and we will make more . We never coach each other but we do talk strategy . We win most of the time but sometimes we lose every game in a tournament . We just focus on having fun . Don’t get me wrong . I like to win . But when you play sports if you are not losing most of the time you are not challenging yourself against better players .

The theory is pretty simple: worry/stress are concerns about the future and they destroy your present focus. Without focus, you play like shit. Why do you personally get so emotional and how do you become mentally stronger? Fuck if I know. That’s work only you can do. Plenty of sports psychology youtube channels to learn from though.