№ 01Eduardo Rodríguez owns a 4.89 xERA across 102.0 innings, the underlying number the market keeps ignoring while his ERA does the talking.
№ 02Brandon Sproat opposes him with a 4.64 xERA across 75.0 innings, so both starters project below the surface-level run prevention.
№ 03Rodríguez's 2.21 ERA sits 2.68 runs below his 4.89 xERA, and his 4.75 FIP backs the case for regression.
№ 04Chase Field is playing to a 1.06 run environment this season, and the visiting offense is averaging 4.7 runs per game over the last 7 days.
№ 05Only a 17.1% strikeout rate from Rodríguez means bat-to-ball damage is available if the underlying numbers are the real read.
§ 01The analysis
The number to anchor on is Rodríguez's 4.89 xERA over 102.0 innings, a figure that flatly disagrees with the 2.21 ERA sitting next to his name. That's a 2.68-run gap between results and expected work, and a 4.75 FIP lines up on the xERA side of the argument. He's only punching out 17.1% of hitters, so the contact is there to be squared up. Sproat isn't a stopper either: his 4.64 xERA across 75.0 innings puts both starters in the same tier, and this matchup lives in a Chase Field environment playing to a 1.06 run factor. The visiting bats are trending in the right direction for an over, averaging 4.7 runs per game over the last 7 days. The honest counter is the shape of Rodríguez's recent form. Over his last 5 starts, the arrow points up: a 5.00 ERA in the earlier outings has given way to a 0.66 ERA in the most recent ones. Sproat's swinging-strike and K stuff is also trending up, and the home offense has cooled to 4.4 runs per game over the last 7 days.
§ 02The call
The read here is expected-runs versus results. Rodríguez's 4.89 xERA and 4.75 FIP describe a pitcher whose 2.21 ERA has outrun the process, Sproat's 4.64 xERA gives no counterweight on the other side, and Chase Field's 1.06 run environment plus the visitors' 4.7 runs per game over the last 7 days point to enough traffic to clear 8.5. The risk is Rodríguez's 0.66 ERA in his most recent starts holding through one more outing.
Final resultLOSSOver 8.5 -117 · -117 Graded Jul 5, 2026