Game Details

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Date

Tuesday, April 21, 2026

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First Pitch

5:41 PM EDT (21:41 UTC)

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Venue

Fenway Park, Boston, MA

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TV/Streaming

MLB.TV

Odds at a Glance

Betting lines were not publicly available at the time of publication. Check your preferred sportsbook for the most up-to-date moneyline, run line, and over/under figures for this interleague matchup.

Market	Arizona Diamondbacks	Boston Red Sox
Moneyline	TBD	TBD
Run Line (-1.5)	TBD	TBD
Over/Under	TBD	—

Preview: A Tale of Two Struggling Clubs

When the Arizona Diamondbacks (10-13) roll into Fenway Park to face the Boston Red Sox (9-13) on April 21, 2026, fans will witness two National League and American League clubs still searching for a consistent winning formula through the first quarter of the season. Neither team is where it hoped to be — Arizona sits third in the NL West, four games back of the red-hot Los Angeles Dodgers (16-7), while Boston is tied for fourth place in the fiercely competitive AL East, also four games behind the division-leading New York Yankees (13-9).

Still, there are compelling storylines on both sides: Arizona is carrying genuine momentum after winning four of its last six games, headlined by a pair of series victories that suggest the lineup may finally be clicking. Meanwhile, Boston absorbed some tough losses against Detroit before rallying on Patriots' Day, and now faces a fresh test against a dangerous NL squad in an interleague clash at Fenway. With postseason positioning beginning to matter more with every passing week, both clubs will be treating this like a statement opportunity. Here's everything you need to know before first pitch.

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Arizona Diamondbacks Analysis

Season Overview

Arizona enters this game at 10-13, a below-.500 mark that nevertheless contains some encouraging signs. The Diamondbacks have gone 8-5 in away games, which bodes well for any visit to Fenway Park. Their run differential sits in negative territory (-18), reflecting some blowout losses — including a 17-2 shellacking at the hands of Atlanta — but their recent stretch has been markedly better.

Recent Form (Last 5 Completed Games)

vs. Blue Jays – L 10-4
vs. Blue Jays – W 6-2
vs. Blue Jays – W 6-3
@ Orioles – W 8-5
@ Orioles – W 4-3

Arizona went 4-1 over its last five completed games heading into this matchup, sweeping two of three from the Orioles on the road before splitting the Blue Jays series. The offense showed flashes of brilliance in that stretch — scoring six or more runs in three of those contests.

Key Players

Corbin Carroll (OF): Arizona's offensive cornerstone had a grand slam in a 6-2 win over the Blue Jays, though he exited Sunday's loss (10-4) early with low back tightness. The team indicated they were "not concerned," but his status should be monitored ahead of first pitch. When healthy, Carroll is one of the most dynamic players in the NL — a legitimate stolen base threat who can change the game's complexion with both his bat and his legs.

Michael Soroka (SP): The big right-hander has been Arizona's most reliable arm in the rotation so far in 2026, notching four wins — tied for the MLB lead among starting pitchers. Soroka, at 28, brings size (6-foot-5, 250 lbs.) and a sinker-heavy approach that generates weak contact. He's been the ace this team needed heading into the season, and whoever gets the ball in this game will have a tough act to follow.

Nolan Arenado (3B): The veteran third baseman has been contributing in the lineup, hitting a home run during the Blue Jays series. Arenado's experience and clutch-hitting ability give Arizona a steady presence in the middle of the lineup.

Yonathan Gurriel: The outfielder was activated after missing all of 2025 with an ACL tear — a notable comeback story and a boost to Arizona's lineup depth.

Rotation Depth: Beyond Soroka, Arizona features Zac Gallen, Merrill Kelly, Brandon Pfaadt, and Eduardo Rodriguez in the rotation. Gallen and Kelly are experienced veterans capable of going deep into games when sharp. The D-backs have multiple options depending on how their rotation lines up.

Injury Watch

Corbin Carroll (OF): Day-to-day with low back tightness after exiting Sunday's game early. Monitor his status ahead of first pitch.

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Boston Red Sox Analysis

Season Overview

The Red Sox stand at 9-13, tied with Toronto for fourth place in the AL East. Boston has been streaky — capable of run-scoring explosions (an 8-6 Patriots' Day win over Detroit) but also prone to offensive droughts and pitching inconsistencies. Their road record (4-9) is a concern, but this game is at Fenway, where they've gone 5-5 on the season.

Recent Form (Last 5 Completed Games)

vs. Tigers – W 8-6 (Patriots' Day)
vs. Tigers – L 6-2
vs. Tigers – L 4-1
vs. Tigers – W 1-0
@ Twins – W 9-5

Boston went 3-2 in its last five, including a gritty Patriots' Day comeback. The offense is streaky — capable of generating big innings but also going cold. Pinch-hitter Ceddanne Rafaela's two-run, tiebreaking single in the seventh inning of Monday's win was exactly the kind of clutch hit that could give Boston confidence heading into this matchup.

Key Players

Garrett Crochet (SP/Ace): Boston's prized starter has been inconsistent in 2026. He was roughed up in Sunday's loss to Detroit — allowing a three-run homer that keyed a four-run fifth inning. Whether Crochet or another arm takes the mound against Arizona, the Red Sox need their rotation to stabilize quickly.

Wilyer Abreu (RF): The right fielder is Boston's team leader in batting average and is the kind of contact-oriented hitter who gives pitchers headaches. His ability to put the ball in play consistently is crucial for the Red Sox offense.

Ceddanne Rafaela (OF): The versatile outfielder came up big in Monday's Patriots' Day game with a tiebreaking two-run single. He brings energy, athleticism, and a knack for situational hitting.

Lineup Depth: Boston's lineup features some professional hitters and can score runs in bunches — proven by the 8-6, 9-5, and 9-3 victories earlier in the year. The offense isn't the problem; consistency is.

Injury Watch

Sonny Gray (SP): Boston's veteran starter was placed on the 15-day injured list with a right hamstring strain, the day after leaving Monday's game against Detroit. Gray, in his first season with the Red Sox after being acquired from St. Louis in November, is a significant rotation loss. His absence will put pressure on the rest of the pitching staff.

Head-to-Head & Betting Trends

Arizona and Boston don't see each other often in interleague play, and specific head-to-head data for this matchup in the current era was unavailable at press time. However, based on their current team profiles and trajectories, several contextual trends stand out:

Arizona is 8-5 on the road this season, suggesting they travel well — a favorable trend for this Fenway visit.
Boston is 5-5 at home — hardly a fortress, giving the Diamondbacks a legitimate shot in this environment.
Sonny Gray's IL placement disrupts Boston's rotation plan, potentially forcing a bullpen game or a spot start, which carries risk.
Arizona's momentum (4-1 in last five) contrasts with Boston's 3-2 stretch, giving the Diamondbacks a slight edge in recent form.
Corbin Carroll's health is the biggest swing factor for the Diamondbacks — if he's healthy and in the lineup, Arizona's offense gets significantly more dangerous.
Both teams' offenses are capable of crooked numbers, making the over a potentially live option once lines are released — Boston has allowed 102 runs this season, while Arizona's pitching has surrendered 143.

FAQ

What time does the Arizona Diamondbacks vs Boston Red Sox game start on April 21, 2026?

First pitch is scheduled for 5:41 PM EDT (21:41 UTC) at Fenway Park in Boston, Massachusetts.

Is Corbin Carroll playing in this game?

Carroll left Sunday's game against the Blue Jays with low back tightness. The Diamondbacks said they were "not concerned," making him day-to-day. Fans should check the team's pregame lineup for his official status.

Is Sonny Gray starting for the Red Sox?

No. Sonny Gray was placed on the 15-day injured list with a right hamstring strain, the day after leaving Monday's game against Detroit. His replacement in the rotation is to be determined.

Where is this game being played — Fenway Park or Chase Field?

This interleague game is being played at Fenway Park in Boston, Massachusetts, making the Red Sox the home team.

Who leads Arizona's starting rotation in 2026?

Michael Soroka has been Arizona's most effective starter this season, racking up four wins to tie for the MLB lead among starters. He's been arguably the D-backs' most valuable player through the first quarter of the season. ---