The round after the "First Four", the round of 64 played on Thursday and Friday, was called the "second round"; the round of 32 was then called the "third round", consisting of games played on Saturday and Sunday.
The round after the "First Four" is the "second round", and consists of 64 teams playing 32 games; it is played on Thursday and Friday. The next round, the "third round", consists of 32 teams playing 16 games that are played on Saturday and Sunday.