Pittsburgh Pirates vs. St. Louis Cardinals Prediction – August 29, 2026
The Pittsburgh Pirates make the trip to Busch Stadium to face the St. Louis Cardinals on August 29, 2026, in what projects to be one of the tighter NL matchups of the late-season slate. The WP Baseball Predictor model has identified the Pirates +1.5 as its pick, backed by a 52.6% win probability for Pittsburgh against a 47.4% chance for St. Louis. With no strong favorite on either side, this one is worth a closer look before locking anything in.
Starting Pitcher Matchup: Bachar vs. Leahy
The pitching matchup sits at the center of this preview, and it's a tale of two contrasting xFIP profiles heading into Saturday's contest.
Lake Bachar (Pirates)
Lake Bachar takes the hill for Pittsburgh carrying an xFIP of 4.27. That number suggests he carries some measurable risk when it comes to run prevention, and Cardinals hitters will be looking to exploit any early-count mistakes. Bachar will need to work efficiently against a St. Louis lineup that, while not explosive on paper, is capable of grinding out at-bats.
Kyle Leahy (Cardinals)
On the other side, Kyle Leahy enters with a notably sharper xFIP of 3.58, making him the more projectable arm in this matchup from a peripherals standpoint. That edge on the mound gives St. Louis a legitimate path to keeping the Pirates' offense in check. However, a stronger pitching projection alone doesn't always translate to a win, and the team-level data tells a more nuanced story.
Why WP's Model Favors Pittsburgh
Despite Leahy holding the xFIP advantage, the WP model still leans Pittsburgh at 52.6%. The reason becomes clearer when examining team-level production. The Pirates carry a wOBA of 0.319 and a team FIP of 3.96, both of which outperform St. Louis's marks of a 0.306 wOBA and a 4.14 FIP. Pittsburgh's pitching staff has also posted a team ERA of 4.21, nearly identical to the Cardinals' 4.22.
In short, the Pirates carry broader roster-level advantages that offset Leahy's individual pitching edge. The model sees Pittsburgh as a slightly more complete team on both sides of the ball, even in a road environment.
Injury Report: Key Absences for Both Clubs
Injuries are a significant subplot heading into this game, with both rosters managing notable absences.
Pirates Injuries
- Jhostynxon Garcia – Undisclosed (7-Day IL)
- Robert Hassell – Undisclosed (7-Day IL)
- Ryan O'Hearn – Quadriceps (10-Day IL)
- Endy Rodriguez – Hip (10-Day IL)
Cardinals Injuries
- Hunter Dobbins – Forearm (15-Day IL)
- Travis Honeyman – Undisclosed (7-Day IL)
- Blaze Jordan – Ankle (10-Day IL)
- Andre Pallante – Elbow (15-Day IL)
- Everson Pereira – Hand (10-Day IL)
St. Louis is dealing with a longer injury list, including multiple pitching and positional pieces sidelined. Pallante and Dobbins on the IL puts added pressure on the Cardinals' bullpen depth, which could become a critical factor if Leahy doesn't go deep into the game.
Dark Horse Home Run Picks
Every close matchup has a player capable of breaking it open, and our dark horse HR picks for August 29 are worth monitoring.
Pirates: Rafael Flores Jr.
Flores Jr. is the name to watch in the Pittsburgh lineup. In a game where run support for Bachar could prove decisive, a long ball from Flores Jr. would be a significant momentum swing.
Cardinals: Joshua Báez
On the St. Louis side, Joshua Báez is our dark horse pick to go deep. If the Cardinals are going to climb back into this game against Pittsburgh's bullpen, Báez providing a spark with the long ball is a realistic path forward.
Final Prediction
This is a razor-thin matchup where small edges matter. The WP Baseball Predictor's lean on Pirates +1.5 is well-supported by Pittsburgh's stronger team-level metrics and a Cardinals roster navigating a crowded injury list. Expect a competitive, low-margin game — but back Pittsburgh to cover.