By Jennifer Piacenti Eight teams will punch their tickets to the Sweet 16 on Saturday. Here are the opening lines for Saturday’s eight second-round games. Are you having fun yet? Welcome to March. It was certainly “madness” Thursday as we saw No. 2 Kentucky, No. 5 Iowa, and No. 5 UConn all go down in the first round. Cinderella team No. 15 St. Peter’s stole Thursday’s spotlight in the biggest upset, but can it continue the magic? Here are the current odds from SI Sportsbook for Saturday’s second-games: Check the Latest NCAA Tournament Odds and Lines from SI Sportsbook: No. 1 Baylor (27-6) vs. …