Pérez arrives on six days of extended rest after a clean six-inning, zero-run effort against Cincinnati on August 16. The start before that was seven innings, zero runs, seven strikeouts against Pittsburgh. His one rough outing in the last three came at Atlanta, where he allowed four runs but still punched out nine batters in five frames. The 9.78 K/9 rate tells the story. He misses bats consistently. loanDepot Park's enclosed roof locks conditions in and removes all weather-related variance, giving Pérez exactly the controlled environment where his stuff plays at its peak.

The Nationals are walking into a difficult spot. Washington is 2-8 over their last 10 games, batting .226 during that stretch, and their most dangerous hitter, CJ Abrams, is listed day-to-day with an ankle injury. Abrams slashes .279/.354/.530 with 29 home runs on the season, so his presence or absence reshapes the offensive ceiling entirely. Irvin has not given Washington much to work with lately. He was knocked out after 3.1 innings against the Cubs on August 11, then surrendered four earned runs in six frames at New York last time out. In two career starts against Miami, he totaled just 4 and 3 strikeouts across 11 innings, with no track record of dominance against this club.

loanDepot Park carries a runs factor of 0.94 and a home run factor of 0.88, both mildly suppressive, both favoring the cleaner pitching profile. Sanoja gives Miami a legitimate threat entering with a 1.276 OPS over the last seven days, facing a pitcher with no established book on him. Worth acknowledging before committing: Pérez has historically struggled with Washington specifically, posting a 4.0 IP/7 ER disaster against this organization in September 2025 and a 4.0 IP/0 K effort in June 2025. The 2026 version is a sharply improved pitcher, and that history reflects an earlier, less refined arm. But organizational familiarity is a real factor, and if Irvin avoids a big inning while Washington cobbles together early on-base production, this game can play tighter than the matchup data suggests.

• Pérez's 9.78 K/9 rate against a Washington lineup batting .226 over 10 games sets up a high-volume strikeout outing. His last three starts produced 5, 7, and 9 strikeouts, with two of three clearing the 6.5 line.
• Irvin has surrendered nine earned runs across his last 9.1 combined innings, and his two career starts against Miami total just 7 strikeouts across 11 innings. He is a contact pitcher in a bad stretch, not a swing-and-miss arm.
• CJ Abrams' availability is the X-factor. A scratch removes Washington's best bat and their most credible power threat. Pérez has already held Abrams to a .154 average across 13 career plate appearances, so even a healthy Abrams is a tough matchup when this starter is on.
• loanDepot Park's enclosed dome removes weather variance and leans mildly suppressive on run scoring. The runs factor of 0.94 and HR factor of 0.88 both favor a lower-scoring game, consistent with the model's directional lean to the under.
• Washington is 38-50 against right-handed pitchers in 2026. That split is not a coincidence in the context of their 2-8 recent stretch. Pérez is a righty on full rest and posting the best numbers of his career.
• Keibert Ruiz has been Washington's lone offensive bright spot, going 13-for-34 with 7 RBI over the last 10 games. If he gets hot against Irvin, he is the most likely National to disrupt a clean Miami win.

The honest caveat is Pérez's complicated history against Washington specifically. His three prior career starts against this organization include a 4.0 IP/7 ER disaster and a start where he failed to record a single strikeout in four innings. The 2026 version is a sharply improved pitcher, and those outings reflect an earlier, less refined arm. Still, if Washington chips away early and Irvin grinds through four or five innings without a blowout, the run line can get uncomfortably close late. The edge doesn't care what sport you're watching. Rest, context, price, same formula, different field. Pérez has all three working in his favor today. At +100 on the run line, the price is right to accept the variance.

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