That marks the first time since April 14-15 (Odrisamer Despaigne and Brandon Morrow) -- and only the third time this season -- that Padres starters have worked seven innings in back-to-back starts.
Against the Cubs on Tuesday, Shields yielded two runs on a pair of homers in his seven-inning outing. He allowed six hits and a walk.
Ross allowed Chicago three runs on four hits and three walks in seven innings on Wednesday.
Shields had 11 strikeouts, his second-highest total of the season and the 25th double-digit strikeout game of his career.