Tournaments usually have teams participating in them which are a mix of invited teams and qualified teams. This is done to ensure that the quality of teams is high. Despite sending out invites, everyone has a chance to attend the tournaments through open qualifiers. Any upcoming teams are climb through ladder system to potentially make it big in the tournament.
Cloud9 won the Season 9 of D2C. Despite winning season 9, they were not invited to Season 10. This is definitely against the normal practice of inviting the winner of last season. We hope they do get invited and make it to a respectable win at the tournament.
— Christoffer Winther (@RyzeDota) February 15, 2017