Atlanta Braves give Perez start after scratching Lopez

Reynaldo Lopez was pulled from his scheduled start against the Washington Nationals on Saturday with left knee inflammation, forcing the Atlanta Braves to turn to veteran lefty Martin Perez on short notice. Knee inflammation is the kind of vague but concerning descriptor that tends to linger — it rarely resolves overnight — making this more than just a one-game roster shuffle.

Lopez has been one of the more reliable arms in Atlanta's rotation this season, and any extended absence from that group has real consequences for a Braves club navigating a competitive National League landscape. Perez steps in as a serviceable replacement on paper, carrying a 3-1 record and a 3.79 ERA, but the circumstances of an emergency start introduce meaningful uncertainty regardless of his numbers.

From a betting standpoint, late starting pitcher changes are among the most significant line movers in baseball wagering. Books adjust quickly — and sometimes dramatically — when a confirmed starter is scratched, particularly when the replacement is an emergency option rather than a scheduled turn. If Lopez was factored into the closing line, sharp bettors who caught the original number may have gotten favorable pricing on the Nationals, since Washington suddenly faces a different pitcher than the one oddsmakers priced in. The direction of that movement depends heavily on the perceived gap between Lopez and Perez, as well as how each fares against Washington's specific lineup construction. Lefties and righties create genuinely different matchup profiles, and a late swap like this can flip the texture of a game entirely.

Totals are worth watching here as well. Perez is a contact-oriented pitcher who works differently than Lopez — if he's expected to allow more traffic on the bases, the over becomes more attractive, particularly if the Nationals can exploit favorable splits. Emergency starters also tend to have shorter leashes, which means a bullpen game is a realistic outcome, and that added reliever exposure often nudges totals upward in live betting markets as the game progresses.

Going forward, the primary thing to track is the severity of Lopez's knee issue and whether he lands on the injured list. Inflammation that warrants a scratch with no advance warning could easily sideline him for a week or more, which would force Atlanta to make rotation decisions that ripple into future pitching matchups and game-level pricing. Bettors should also monitor whether Perez's performance Saturday earns him another opportunity or whether Atlanta looks externally for rotation depth. How the Braves manage the next few days will tell you a great deal about how serious they consider this situation to be.

Reporting via ESPN. Analysis by the 4th & Value desk.