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Today · 8:40 PM ETLineup pendingNL West

Arizona Diamondbacks   vs   Colorado Rockies Preview

September 23, 2026

Starting pitchers, lineup status, recent form and weather at Coors Field.

8:40 PM ET · Coors FieldStats availableLineups not confirmed
T-Score48
Arizona Diamondbacks
82–74 · 3rd NL West · T-Score 48
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First pitch 8:40 PM ET
Colorado Rockies
57–99 · 5th NL West · T-Score 26
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T-Score26
First pitch 8:40 PM ET

Matchup at a glance

PitcherStat calculation
CategoryComparisonWhy
Starting pitcherRockiesThe starters are close overall, but Adams owns the better strikeout and control profile.
Offense vs handRockiesColorado has produced the stronger offense against right-handed pitching.
Team strengthDiamondbacksArizona leads 48–26 in T-Score.
WeatherLow impact67°F, wind 4 mph, no precipitation expected at first pitch.

Starting pitchers

AZ
Merrill Kelly RHP
Merrill Kelly
Arizona Diamondbacks
2026 season (MLB rank among qualified starters)
ERA
5.00
159th
WHIP
1.47
180th
K/9
6.38
192nd
BB/9
3.96
172nd
P-Score39i
FIP
5.47
HR/9
1.61
182nd
OPS/R
0.746
IP
156.2
2026 ERA splits
Home ERA5.83
Road ERA4.36
Last 5 starts
COL
Mason Adams RHP
Mason Adams
Colorado Rockies
2026 season (MLB rank among qualified starters)
ERA
5.09
165th
WHIP
1.65
210th
K/9
9.00
65th
BB/9
4.70
203rd
P-Score48i
FIP
5.67
HR/9
2.35
218th
OPS/R
0.969
IP
23.0
2026 ERA splits
Home ERA5.79
Road ERA2.57
Last 5 starts
How the starters differ
·Adams strikes out 2.6 more batters per nine innings.
·Kelly allows the lower home-run rate: 1.61 vs 2.35 per nine.
·Kelly allows fewer baserunners, with a 1.47 WHIP compared with 1.65.
·Kelly enters with a 4.36 road ERA; Adams owns a 5.79 ERA at home.
Advanced starter metricsERA−, FIP, WAR, career vs opponent
MetricKellyAdamsNote
ERA−11771Park- and league-adjusted; 100 is average.
FIP5.475.67
WAR-0.30.0Season value.

How the lineups match the starters' pitch mix

Pitch data coverage: partial. Usage and velocity only.

Kelly arsenal
PitchUsageVelo
Four-seam28%92.1
Changeup28%88.5
Cutter13%91.0
Curveball12%82.5
Slider10%86.3
Sinker10%92.4
Adams arsenal
PitchUsageVelo
Four-seam34%93.2
Sinker26%92.3
Curveball18%81.9
Sweeper12%85.5
Changeup5%88.1
Cutter5%88.4

Team OPS vs opposing starter's hand

Diamondbacks vs RHP (Mason Adams)
28th
in MLB
0.689OPS
.600.700.800.9001.000
Rockies vs RHP (Merrill Kelly)
4th
in MLB
0.755OPS
.600.700.800.9001.000

Lineups

Lineup pendingOrder from the stored snapshot; treat as unofficial until the card is filed.Full lineup page
Lineups not announced

Neither club has posted a batting order. Handedness composition, H-Score leaders and batter-vs-pitcher samples appear here as soon as the first order is filed — typically two to three hours before first pitch.

Team comparison

ResultsAZAZ·COLCOL
+23116th
Run differential
+10528th
82–74 Record57–99
Last 10 games
Arizona Diamondbacks (0–0)
Colorado Rockies (0–0)
2026 head-to-head
Season Series
0—0
0 Games Played

Frequently asked

Who is starting for the Diamondbacks?+
Merrill Kelly is listed as the starter.
Who is starting for the Rockies?+
Mason Adams is listed as the starter.
What time does the game start?+
8:40 PM ET at Coors Field.
Where is the game being played?+
Coors Field, home of the Colorado Rockies.
Are the lineups confirmed?+
Not yet. Orders appear here when they are posted.
How do the starters compare on P-Score?+
Merrill Kelly is at 39; Mason Adams is at 48. P-Score is PitcherStat's 0–100 season index for qualified starters.