For 13 1/2 innings in Detroit, the Seattle Mariners looked like a sure thing for the ALCS.

But the last 4 1/2 innings that transpired at Comerica Park on Wednesday have now introduced a healthy dose of doubt going into a do-or-die Game 5 Friday at T-Mobile Park that Tigers ace Tarik Skubal will start.

Start time set for Mariners’ decisive ALDS Game 5 vs. Tigers

The good news: The Mariners have now won three games this season that Skubal has pitched against them.

The bad news: You’re now hoping the Mariners can beat the reigning AL Cy Young for a fourth time in six months.

Is the good news more good than the bad news is bad? We won’t know until Friday.

But let’s err on the side of optimism, because at least for now we can.

First, how much can the Tigers reasonably expect out of Skuba

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