Your competition wants you to make mistakes. It creates opportunities for them to score runs when your players make errors. That's why it's crucial to train your team to play under pressure.
Getting your team mentally ready will help them compete. As a coach, you play a big role in this. After all, if you get emotional, so will your athletes. Conversely, if you stay calm and focused, they'll follow suit. For more on prepping your players mentally, watch this video featuring Yvette Healy.