№ 01Eduardo Rodríguez owns a 5.06 xERA across 114.0 innings, a profile that argues his run prevention has been living on borrowed time.
№ 02The 2.77-run gap between his 2.29 ERA and 5.06 xERA is the headline, and his last 5 starts show ERA climbing from 0.66 to 3.00.
№ 03Andre Pallante is drifting the same direction, with ERA over his last 5 starts jumping from 2.08 to 5.06 while his swinging-strike and K stuff trend down.
№ 04Rodríguez leans on fastballs 60.2% of the time and the Cardinals carry a .347 xwOBA against fastballs across 2037 plate appearances this year.
№ 05Chase Field runs a 1.06 park factor, the Diamondbacks are averaging 4.5 runs per game over the last 7 days, and St. Louis is trending up versus lefties.
§ 01The analysis
The case for over 9 starts on the mound in Arizona, where Eduardo Rodríguez brings a 5.06 xERA across 114.0 innings into a day game his surface 2.29 ERA has done a nice job hiding. That 2.77-run gap is the tell, and the last 5 starts back it up, with his ERA climbing from 0.66 in the earlier outings to 3.00 in the most recent ones despite a modest 17.1% strikeout rate. Andre Pallante is drifting the same way, his ERA over the last 5 jumping from 2.08 to 5.06 while his swinging-strike and K stuff both trend down and his own strikeout rate sits at 17.0%. The matchup layers well: Rodríguez throws 60.2% fastballs into a Cardinals lineup carrying a .347 xwOBA against fastballs across 2037 plate appearances, while Arizona's bats are averaging 4.5 runs per game over the last 7 days and St. Louis has trended up versus left-handed pitching across 267 plate appearances this season. Chase Field's 1.06 run environment nudges everything higher, and if starters exit early, Paul Sewald's 4.58 ERA and Riley O'Brien's 4.36 xERA don't slam the door.
§ 02The call
The counter is real. Arizona's lineup has been trending down against right-handed pitching across 703 plate appearances, and Pallante's 48.1% breaking-pitch usage runs into a Diamondbacks group posting just a .272 xwOBA against breaking stuff over 1014 plate appearances. Sewald's 3.28 xERA also hints his late-game work has been worse than his true ability. Add the missing bats in Jordan Lawlar and Lourdes Gurriel Jr., plus a home catcher stealing 0.7 called strikes per 100 taken pitches, and there are reasons for pause. Over 9 at -105 still lines up with the stronger side of the ledger.
Final resultWINOver 9 -105 · -105 Graded Jul 19, 2026