"To enter the tournament" means to participate or join a competition or event where individuals or teams compete against each other for a prize or recognition. Full definition
You can then enter tournaments as a group, and can invite people to play with you at certain times. (theguardian.com)
Red - hot teams that enter the tournament with confidence are more likely to make noise than those coming in with doubts and multiple recent losses. (sbnation.com)
Besides friend invites, leaderboards, and online play you can also enter tournaments for a chance to win big in - game money. (levelsmack.com)