Well, boys are all competitive, especially in the finals, no one wants to lose, but only games with wins and losses are what they pursue, so tell them not to care too much, wins and losses are common, as long as you work hard, that's the most important thing, they are all heroes in the class.
Hehe, give them a gift to encourage them, you can give them a new basketball, let the whole class sign on it, and give it to them as a support, or you can make a crystal trophy and give it to them, they will always be the first in the class.
You can also buy a set of real dolls online, or make a digital oil painting, put the team members on it, it's very realistic, put it in the class, and it can also enhance the cohesion of the class. I hope it helps you.