Jackson Twait

Dennis Mong / NBC

We know how many. We just don't know who. NBC tells me that 13 contestants from the Cincinnati American Ninja Warrior finals airing Monday will advance to the four-week national finals in Las Vegas where the winner gets $1 million.

Who are the 13? We'll find out 8-10 p.m. Monday, Aug. 19, when NBC broadcasts the Cincinnati finals taped Memorial Day weekend. It was shot the night after filming the Cincinnati auditions broadcast July 8.