I'll disagree with everyone but only because I think we all forget the magnitude of the games this weekend.
Bringing Keller in on Friday to start might open the door for him to melt. Yes he had a very strong outing against the bluejays last week but we know what pressure can do to the best of players. With this in mind, I'd return to Lemke as he's older, more conditioned, seems to walk fewer batters in "big" numbers. Yes he'll walk one but rarely multiple walks per inning. Keep him on a short leash and if you get 3 innings from him, then consider Keller or Vogt for long relief.
Pierce has performed well but with pitcher friendly strike zones. We don't know how he'll perform with a strike zone that is like that of last Friday night's and therefore keeping our Saturday/Sunday rotation as is, in my opinion, is the safest direction. How many times have we heard from TO and many other highly successful coaches saying the key is to "not" panic? Stay focused, trust the system and play mistake free.
Hawks Field is a special place, the skers know that park, the pitchers know the ball's action, the hitters know the lanes and so, lets lean on tradition, trust the system and play ball the way Erstad, Bolt, Silva and the rest of the staff expects us to play and we'll be fine. Yes the big game atmosphere will be in the air but we know "our" boys have played in it before. What we don't know is whether Purdue has seen a 6K plus crowd chanting the home schools chants in crucial moments of a game. The skers will win this series. I've been saying all season and I've seen nothing to change my opinion. Lemke will start, he'll get three (maybe 4) innings and we'll win this Friday night game. Have faith and trust the ole ballparks hallowed shadows. It's been entirely too long since this ballpark has felt the thrill of a Huge game and because of this it's walls, the bump, the sneaky winds will again awaken and bring us on to victory.