Clear your schedule, and get your mint julep ready. The Kentucky Derby is tomorrow! Of the 151 iterations of the race, NBC Sports’ Tim Layden has covered 22. He explains why the Derby is both the most consistent — and unpredictable — of all sporting events. Also, our numbers guy Steve Kornacki analyzed the Derby field and identified some best bets . Tomorrow, our NBC News sports team will be live-blogging the Derby all day, keeping you up to date on all the biggest hats and the long shots.