№ 01Martín Pérez owns a 3.00 ERA but a 4.04 xERA, a 1.04-run gap that flags his run prevention as overshooting his actual contact quality.
№ 02Atlanta has averaged just 2.6 runs per game over the last 7 days while missing Ronald Acuña Jr. (D10) and Kyle Farmer (D10).
№ 03Our lineup has worked 288 plate appearances against left-handed pitching and trended up, while Atlanta's bats have gone the other way across 347 lefty PAs.
№ 04Pérez leans on his fastball 59.5% of the time, and our hitters carry a .349 xwOBA against fastballs over 1739 plate appearances this year.
№ 05Raisel Iglesias's 1.37 ERA hides a 2.53 xERA, so the late-inning wall Atlanta has been leaning on is shakier than the line score suggests.
§ 01The analysis
The headline number on Martín Pérez is a 3.00 ERA, but the xERA underneath it reads 4.04. That 1.04-run gap is the entry point here at +125, and the supporting case stacks on top of it. Atlanta's offense has averaged 2.6 runs per game over the last 7 days, is playing without Ronald Acuña Jr. (D10) and Kyle Farmer (D10), and has trended down against left-handed pitching across 347 plate appearances this season. Our side has gone the other direction against lefties over 288 plate appearances. Pérez is only striking out 18.1% of hitters and pours in 59.5% fastballs, a pitch our lineup has handled to a .349 xwOBA across 1739 plate appearances. If it goes to a bullpen game, our relief corps ranks 2 of 30 in 3-day pitch volume at 86 pitches, with Riley O'Brien and his 20 saves waiting in the ninth. Atlanta's late-game answer, Raisel Iglesias, carries a 1.37 ERA but a 2.53 xERA, and the Braves have lost 7 of their last 10.
§ 02The call
The risk is our starter. Matthew Liberatore is sitting on a 5.72 xERA and a 5.26 FIP across 77.7 innings, and the last five starts have skewed even worse with a 6.81 FIP over 21.0 innings and a 14.14 ERA in his most recent outings versus 2.79 earlier. Our own offense has only managed 2.0 runs per game over the last 7 days, and Atlanta's pitching staff ranks 3 of 30 with a 3.41 ERA. At +125, the Pérez regression case and a rested bullpen are what's being paid for.
Final resultWINSt. Louis Cardinals ML +125 · +125 Graded Jul 1, 2026