I know the Cubs used 4 starters in the NLDS in 2003 but we had 4 acceptable options. Lester would definitely pitch twice, Arrieta only once so that leaves 2 games. Either the third starter pitches twice, Jake comes back on 2 days rest or we use a 4th starter To expand on that Wed - Arrieta Fri - Lester (game 1) Sat - 3rd starter Mon - Arrieta Tue - Lester on 3 days rest or 4th starter Can't remember if there's a day off before game 5 If there isn't Wed - Either Lester or 3rd starter on 3 days rest or 4th starter. If it's Thu it's Lester or 3rd starter on normal rest