Nearly three years ago, standup comic Tony Rock, the brother of comic and movie star Chris Rock, kicked off the opening of the new location of the Improv with a four-night stand. Now, the guy's back at the club, where he performs tonight at 7:30 and 10. While some of his jokes about racial profiling aren't that innovative and his material on legalizing marijuana is now outdated, Rock has a casual delivery style that makes it easy to relate to him. He'll also perform at the club tomorrow and Sunday. Tickets are $20. (Niesel)