Boston Red Sox vs Kansas City Royals All-Time Record

American League
Boston Red Sox
Kansas City Royals
Red Sox lead Royals271to250since 1969

Retrosheet history through 2025, plus 6 final games from the current feed.

2026 season series: Red Sox lead 5-1

By

Data updated 6 min read

At a glance

All-time since 1969 · current-feed analysis, 2002 to 2026

Boston Red Sox vs Kansas City Royals insights

Current-feed record
+40wins for Red Sox
63% Red Sox · 38% Royals

Red Sox have pulled further ahead since 2023: 18-7.

Recent form
15-5last 20
Red Sox on a 2-game streak

Red Sox won 4-1 on Sep 13, 2026

Where it matters
0Postseason games

No postseason meetings since 2002.

Schedule context
  • Red Sox built the series lead before the 2023 schedule change, taking 82 of 135 decided meetings (61%).
  • Since the schedule balanced out they are 18-7, or 72% to Red Sox.

Red Sox vs Royals complete all-time series record

Boston Red Sox and Kansas City Royals have met 521 times since 1969, never in the postseason. 361 meetings predate the current feed, which adds game-level detail from 2002.

History span
1969 to 2026
First and latest meeting
Before 2002
361
Meetings from the Retrosheet game logs
Since 2002
160
Meetings with game-level detail below
Win Percentage
100W
60W
BOS
KC
63%38%
Boston Red SoxKansas City Royals

Recent Games

Last 10 Games
Sep 13
BOS 4-1 KC
BOS
Sep 12
BOS 5-1 KC
BOS
Sep 11
BOS 2-3 KC
KC
May 20
KC 3-4 BOS
BOS
May 19
KC 1-7 BOS
BOS
May 18
KC 1-3 BOS
BOS
Aug 6
BOS 3-7 KC
KC
Aug 5
BOS 6-2 KC
BOS
Aug 4
BOS 8-5 KC
BOS
May 11
KC 1-3 BOS
BOS
Last Meeting
Sep 13, 2026Final
BOS
4
HOME
KC
1
AWAY
Red Soxwon by3runs
Red Sox' 2nd straight in this series·Game 160 since 2002
Streaks & Momentum
Current Streak
Boston Red Sox: 2 consecutive wins
2
Avg. Margin of Victory
Games decided by 3.6 runs on average
3.6runs
Momentum (Last 10 vs Archive since 2002)
BOS↑Trending Up
Last 1080%
Archive since 200262.5%
KC↓Trending Down
Last 1020%
Archive since 200237.5%
Last 10 Results
BOS / KC

Record since 2002

Season Split & Biggest Wins
Regular season vs Postseason record, plus each team's largest margin of victory
Regular Season160 games
100
60
No postseason meetings appear since 2002.
Boston Red Sox Biggest Win
15–1+14 runs
Jul 1, 2021
Kansas City Royals Biggest Win
13–2+11 runs
Sep 1, 2023
Decade Breakdown
Choose a decade to scope the current-feed page
Season by Season
Season ↓BOS ↕KC ↕Games ↕
2026516
2025426
2024426
2023527
2022347
2021527
2019516
2018516
2017246
2016246
2015437
2014617
2013257
2012437
2011538
2010437
2009538
2008617
2007336
2006459
2005426
2004426
2003516
2002426

All 24 seasons are shown in the table above.

Home / Away Split
55-28BOS HOME32-45KC HOME
AWAY
45-32
BOS
AWAY
28-55
KC
Retrosheet archiveComplete through 2025

Boston Red Sox vs Kansas City Royals all-time record, 1969 to 2025

Explore how this matchup changed by decade, where each lineup produced its runs, and the games that pushed the rivalry record book. This archive is a separate source window from the current-feed sections above, which start in 2002.

Games
515
Peak inning
6
Record game
33 runs
Two source windows. Current-feed sections: 160 games from 2002 to 2026. History Lab: 515 Retrosheet games from 1969 to 2025. The first refreshes with current finals; Retrosheet's published archive currently ends in 2025.

Decade balance

Select an era to inspect pace, scoring and attendance.

The information used here was obtained free of charge from and is copyrighted by Retrosheet. Interested parties may contact Retrosheet at www.retrosheet.org.

Open source archive

Betting Context

Betting context since 2002

How this pairing has settled: run margins, totals and break-even prices derived from its historical record. These are final-score frequencies, not results against a closing line. We do not hold historical sportsbook prices for these games.

One-run games
27.5%

Share of the 160 decided meetings settled by exactly one run.

Won by 2 or more
72.5%

A 2+ run margin crosses 1.5, but this is not a historical line result. Average gap: 3.6.

Average total
9.9runs

Final-score average without accounting for park, bullpen or weather.

Home side wins
54.4%

Share of decided meetings won by the listed home team.

Totals ladder

Where the combined score landed against the half-run lines a book normally posts. Half runs cannot push, so every meeting falls on one side.

LineOverUnderOver rate
7.511248
70%
8.59664
60%
9.5Closest to even7882
48.8%

Fair price from the base rate

The decimal price that corresponds exactly to each club's win share in this archive. It describes the record and does not estimate the next game.

Boston Red Sox
100 W · 62.5%1.60
Kansas City Royals
60 W · 37.5%2.67

A base rate is not a forecast. Starting pitchers, lineups, injuries and venue all matter more to a single game than a multi-season head-to-head record.

Last 20 meetings vs full history

One-run games
25%vs 27.5% full archive
-2.5% in the last 20
Won by 2 or more
75%vs 72.5% full archive
+2.5% in the last 20
Average total
8.3 runsvs 9.9 runs full archive
-1.6 runs in the last 20

Seasons 2023 to 2026. The comparison shows whether the last 20 final scores differ from the longer archive, without assigning a cause or predicting what comes next.

View the break-even percentages in another odds format with the odds converter, or compare current prices for Red Sox and Royals in the oddsmatcher.

Questions about this record: Boston Red Sox vs Kansas City Royals

How do recent Boston Red Sox vs Kansas City Royals results compare with the complete record?

Boston Red Sox have won 8 of the latest 10 decided meetings. Boston Red Sox lead the decided record 271-250. The recent window is a subset of the complete series from 1969 through 2026, so the page reports the two separately.

When did the Boston Red Sox and Kansas City Royals first play each other?

The Retrosheet archive's first recorded meeting for this pairing is May 27, 1969, when Kansas City Royals beat Boston Red Sox 5-4 at home. The archive covers 515 meetings from 1969 through 2025. The current feed starts in 2002 and is reported separately.

About Erik Andersson

Erik Andersson is SharkBetting's Content & Marketing Specialist. His published work focuses on betting methodology, market analysis, regulation and consumer education.

The source windows, derivations and update process for this data page are documented in the methodology above.

View full profile →

Methodology & Data Sources

Current MLB game logs come from the balldontlie API and cover the 2002 season onward. Scores and schedule anomalies are checked against the official MLB Stats API. Spring training is excluded, while results from earlier franchise identities are merged into the current club.

The all-time record and the History Lab use Retrosheet game logs through 2025, with inning lines, team totals, attendance, duration and ballpark fields when available. Final games after 2025 come from the current feed, and every section built on that feed alone is labeled as starting in 2002.

The betting context summarizes completed final scores only. It contains no sportsbook closing lines and summarizes only completed games. Report a possible error through our contact page with the matchup and game date.

Read the full H2H data methodology →

Last updated Sources: balldontlie, MLB Stats API, Retrosheet

Boston Red Sox and Kansas City Royals have met 160 times in this archive, which covers the 2002 season onward.