Answered January 12th, 2020

Jose G. Valdez had his best ERA on the road in a season versus the Cubs in his rookie season in 2012, with an ERA of 0.00.

lowest career era on the road vs the cubs by a pitcher with 6 (g - gs)
Interpreted as:
lowest career era in a regular season on the road vs the cubs by a pitcher with 6 (g - gs)

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