5.12
ERA
1.48
WHIP
5.6
K/9
103.2
IP
18
GS
3.6
BB/9
Arizona Diamondbacks vs Pittsburgh Pirates
—:—
6:40 PM ET
H2H 2–4
PIT · Home · 54-52
Pittsburgh Pirates
Starting pitchers
4.90
ERA
1.31
WHIP
6.9
K/9
108.1
IP
20
GS
3.1
BB/9
vs AZ — career
3.00ERA1GS.190OPP AVG4K
Starter form · last 5 starts
Season5.12
Last 53.54
↓1.58 ERA better in last 5
↓ ERA trending down lately
Season4.90
Last 54.85
↓Recent form near season pace
↓ ERA trending down lately
Matchup edge
Pirates 5–5 L10
Lineup not yet announced · posted ~1–2 hrs before first pitch
Projected hitters vs RHP / RHP
Arizona vs RHP
Avg OPS 0.8382 hot hittersTop: Locklear 0.943 · Lawlar 0.900 · Moreno 0.828
Projected sample — season splits vs pitcher hand, not official order.
Pirates vs RHP
Avg OPS 1.0865 hot hittersTop: Jr. 1.667 · Ross 1.000 · Rodríguez 0.996
Projected sample — season splits vs pitcher hand, not official order.
Arizona Diamondbacks hitters vs RHP (projected)
Batter
AVG
OPS
HR
Pittsburgh Pirates hitters vs RHP (projected)
Batter
AVG
OPS
HR
◆ Matchup preview
Arizona Diamondbacks at Pittsburgh Pirates (2026-07-27). Merrill Kelly vs Mitch Keller at PNC Park.
Starters — Merrill Kelly: 5.12 ERA, 1.48 WHIP, 103.2 IP, 5.64 K/9, 3.56 BB/9, 1.91 HR/9. His last three starts were strong: 5.0 IP/2 ER, 5.0 IP/1 ER, and 7.0 IP/1 ER, with 12 strikeouts and 6 walks across that span. The recent trend is down in ERA, but the season profile still shows elevated traffic and home run risk. Mitch Keller: 4.90 ERA, 1.31 WHIP, 108.1 IP, 6.90 K/9, 3.07 BB/9, 1.08 HR/9. His last three starts were 5.0 IP/0 ER, 3.0 IP/3 ER, and 6.0 IP/5 ER. The trend is also down, and his season indicators are steadier than Kelly’s, especially in WHIP and home run suppression.
Teams — Arizona owns a .709 OPS, 479 runs scored, a 4.27 team ERA, and a 1.30 team WHIP. The Diamondbacks are 6-4 over their last 10 games, and their offensive line is lighter than Pittsburgh’s by both OPS and total runs. Pittsburgh carries a .760 OPS, 553 runs scored, a 4.32 team ERA, and a 1.32 team WHIP. The Pirates are 5-5 in their last 10, with the stronger lineup on paper, while the overall pitching comparison between these clubs is fairly close.
Head to head (2025–2026)
2—4
Pittsburgh Pirates lead series
6 meetings total
2025-07-27
Arizona Diamondbacks @ Pittsburgh Pirates
0–6
PIT
2025-07-26
Arizona Diamondbacks @ Pittsburgh Pirates
0–2
PIT
2025-07-25
Arizona Diamondbacks @ Pittsburgh Pirates
1–0
AZ
2025-05-28
Pittsburgh Pirates @ Arizona Diamondbacks
10–1
PIT
2025-05-27
Pittsburgh Pirates @ Arizona Diamondbacks
9–6
PIT
Team picture · 2026
AZ
PIT
Team AVG
0.242
0.260
Team OPS
0.709
0.760
Home runs
103
135
Runs scored
479
553
Team ERA
4.27
4.32
HR allowed
129
110
Explore more MLB matchups
Related game previews for these clubs and around the league.