Arizona manager Bob Melvin announced his rotation for the first four games against Colorado ? Brandon Webb, Doug Davis, Livan Hernandez and Micah Owings, the same order as for the Cubs series, although Owings did not get to pitch because of the D-Backs? sweep. With an off day Saturday and another next Tuesday, Webb could have started Game 4 on three days? rest and been available on normal rest in a possible Game 7, although he already has pitched 243 1/3 innings this season. ?Workload. Other guys that we have. (Webb) hasn?t done it before,? Melvin said of the reasons for a four-man rotation. ?We try to err on the side of caution. That?s the way we?ve been, and I just don?t see us bringing him back on three days? rest. I don?t like doing it. We did it one time with ?Livo? (Hernandez), but there were a bunch of reasons for doing that. ?The deeper in the season you get, the harder it is to do it, especially with the amount of innings and amount of games Brandon has.?