Because for as good as the Padres have looked lately, they're running it with a patchwork operation. San Diego chose to keep its core together in July rather than sell, betting that its top arms would get healthy in time to hold a playoff spot. That bet gets tested every fifth day Mize takes the mound.
Milwaukee's been grinding rather than blowing teams out to get here — they took 2 of 3 from the Twins and knocked off Pittsburgh twice in a row before boarding the plane west. San Diego's riding a modest heater of its own, having taken 2 of 3 from the Astros to climb back into contention, punctuated by a 7-2 win in the finale. Two teams playing genuinely better baseball than their season-long numbers suggest — but only one of them has a bona fide ace on the mound tonight.
Petco Park at night is still one of the tougher parks in the league to score in, and with Henderson dealing, this has the shape of a game that stays tight into the middle innings — right up until Milwaukee's lineup starts working over a bullpen that's already stretched thin covering for a rotation in triage.