MLB Game Preview: Pittsburgh Pirates (20-17) vs. Arizona Diamondbacks (17-18)

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Arizona Diamondbacks logo

Venue: Chase Field — Phoenix, Arizona

First Pitch: 9:40 PM ET / 6:40 PM MST

Broadcast: SportsNet Pittsburgh, Bally Sports Arizona, MLB.TV

VENUE — CHASE FIELD

Location: Phoenix, AZ

Park Factor: Slightly hitter‑friendly when roof is open; neutral when closed

Dimensions: 413 ft to CF, 374 ft to LCF, 334 ft to LF

Surface: Natural grass with retractable roof

Roof Status: Expected closed due to high temperatures.

A closed roof creates a neutral run environment, reducing weather volatility.

WEATHER FORECAST (Phoenix, AZ — May 7, 2026)

(Roof expected closed — minimal impact on play)

Outside Temperature: 92°F

Humidity: Low

Wind: 7–10 mph (irrelevant with roof closed)

Conditions: Hot, dry desert evening

Impact: With the roof closed, conditions will be stable and pitcher‑friendly relative to typical desert baseball.

INJURY REPORT

Pittsburgh Pirates

Oneil Cruz — OUT (ankle)

Ke’Bryan Hayes — Day‑to‑day (back tightness)

David Bednar — OUT (forearm)

Rowdy Tellez — Day‑to‑day (hamstring)

Marco Gonzales — OUT (shoulder)

Arizona Diamondbacks

Corbin Carroll — OUT (wrist)

Zac Gallen — OUT (elbow)

Gabriel Moreno — Day‑to‑day (hand)

Paul Sewald — OUT (lat strain)

Christian Walker — Day‑to‑day (knee)

Impact: Both teams are missing cornerstone players. Arizona’s offense is significantly weakened without Carroll and potentially Walker; Pittsburgh’s bullpen is compromised without Bednar.

RECENT TEAM FORM

Pittsburgh Pirates

Last 10: 6–4

Road Record: 9–9

Runs/Game: 4.4

Team ERA: 4.02

Trend: Pirates’ pitching has been solid, and the offense has been timely despite injuries.

Arizona Diamondbacks

Last 10: 4–6

Home Record: 10–8

Runs/Game: 4.6

Team ERA: 4.51

Trend: Arizona’s offense has been inconsistent without Carroll, and the bullpen has struggled in close games.

PROBABLE STARTING PITCHERS

Pittsburgh Pirates — RHP Jared Jones

2026 Season: 3–2, 3.54 ERA

Strengths: Power fastball, elite strikeout ability

Weaknesses: Occasional command lapses

Park Fit: Excellent — roof‑closed Chase Field suppresses HR risk

Arizona Diamondbacks — RHP Brandon Pfaadt

2026 Season: 2–3, 4.22 ERA

Strengths: Slider, improving command

Weaknesses: Vulnerable to left‑handed power

Park Fit: Good — neutral environment helps limit big innings

Pitching Edge: Pirates (moderate)

 KEY PLAYER MATCHUPS

Bryan Reynolds (PIT) vs. Brandon Pfaadt (ARI)

Reynolds crushes right‑handed pitching

Pfaadt struggles vs. switch‑hitters with power Edge: Pirates

Ketel Marte (ARI) vs. Jared Jones (PIT)

Marte handles high‑velocity fastballs well

Jones’ slider could neutralize him Edge: Even

Jack Suwinski (PIT) vs. Diamondbacks Bullpen

Suwinski thrives vs. right‑handed relievers

Arizona’s bullpen ERA is bottom‑third Edge: Pirates

Christian Walker (ARI) vs. Pirates Pitching

(If active)

Walker is Arizona’s most consistent power threat

Jones’ fastball/slider combo is a tough matchup Edge: Pirates

SERIES HISTORY

2025 Season: Pirates won season series 4–2

At Chase Field: Teams have split last 6

2026 Series: Pirates lead 2–0 entering this game

Trend: Games have been moderate‑scoring with late‑inning volatility

BETTING TRENDS

Pittsburgh Pirates

Pirates are 5–2 in last 7 road games

Under is 6–3 in last 9 Pirates games

Pirates are 4–1 in last 5 vs. NL West

Arizona Diamondbacks

Diamondbacks are 3–6 in last 9 home games

Over is 5–2 in last 7 Pfaadt starts

Arizona is 2–5 in last 7 vs. teams above .500

Head‑to‑Head

Pirates are 7–3 in last 10 meetings

Under is 6–4 in last 10

Average combined score: 8.2 runs

Game Odds

Pittsburgh Pirates                            9

Arizona Diamondbacks                 – 115

Odds Courtesy of Sports Odds Direct as of Wednesday, May 6, 2026