Merryweather was said afterwards to be unavailable because he was warmed up multiple times on Saturday, though in the best case scenario someone has to be available to pitch the 9th too. Keller threw 46 pitches on Friday and somebody needs to be available in relief of Brown tomorrow(who is probably going to give you 5 max). It sucks to watch, but there isn't an obvious solution, you don't want to hamstring yourself for Monday in pursuit of *only* losing by 2 Sunday. Thanks to the Tokyo series interrupting preseason buildup they need to be cautious to avoid injury, and that means there aren't a lot of Plan Cs when you need the pen to give you 16 innings over 4 days with no off day coming til Thursday.