SAN FRANCISCO -- The Giants have three established starters leading their pitching staff in Logan Webb, Robbie Ray and Justin Verlander, but the back end of the rotation is far greener.

With Landen Roupp (left knee bone bruise) on the injured list, Kyle Harrison in Boston and Hayden Birdsong down at Triple-A Sacramento, the Giants have been leaning on a pair of rookies -- Carson Seymour and Kai-Wei Teng -- to make big starts in September.

But that inexperience has yielded mixed results, as evidenced by Seymour’s rough start in the Giants’ 5-3 loss to the D-backs on Wednesday afternoon at Oracle Park.

Seymour recorded only four outs in his third career start for San Francisco, surrendering four runs on six hits, including a leadoff home run to Geraldo Perdomo in the first inning.

Pe

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