SF · P

Adrian Houser

Age 33 B/T R/R 6′4″, 227 lb USA MLB debut 2015

40-man

San Francisco’s roster as it stands #3 starter · 117 IP · 0.7 WAR in the role
Injured list Ended 2026 on the 60-day IL: Right forearm strain (since Aug 26)
Trade read Unlikely to be traded: Signed in Dec 2025 (2 yr, $22M (2026-27), 2028 club option): clubs rarely move a player they just committed to.

Keystone Stuff 90 13th pct

2026 fWAR 0.4

Projected 2027 WAR 0.7 at 123 IP · 0.7 in his 2027 role

Pitching · 2026 percentiles

vs. MLB pitchers with 500+ pitches · 1,731 pitches

Keystone Stuff 90

Keystone Location 106

Keystone Pitching 93

Run value (xRV) −0.61

Strikeout % 16.0%

Walk % 7.2%

Whiff % 18.1%

Chase % 25.8%

Fastball velo 95.2

Extension 6.7 ft

109.2 IP4.02 ERA4.55 FIP 38° arm

Arsenal & Pitch Lab

Movement normalized to arm side · Keystone Stuff by pitch

RHP · arm angle 38° · how to read

Pitch	Use	Velo	IVB	HB	Stuff	Loc	Whiff	xRV/100
Sinker46% use	46%	94.9	7.5	+16.2	100	106	9%	−0.87
Four-seam22% use	22%	95.7	14.6	+8.8	79	103	19%	+0.43
Changeup16% use	16%	85.3	4.4	+13.3	89	98	36%	+0.24
Slider10% use	10%	88.4	4.4	−2.1	100	112	16%	−1.75
Curveball7% use	7%	82.3	−9.4	−8.4	92	90	28%	−2.46

Pitch idea (fragile)

Built from his own fastball (94.9 mph) plus the typical shape 17 pitchers with his slot (38°) throw: a splitter around 86.8 mph, −6.4″ rise, +19.7″ arm-side. On the same model it grades +30 against his changeup, the pitch with the same job (+20 to +39 across the production and three cross-fit models), about 119 on his changeup’s scale; the comps’ own splitters grade 99 at the median, so that sits above 100% of them. That would out-grade 100% of the comps’ real pitches, more likely a result of how the pitch was built than of the pitch, so it isn’t queued.

Most similar pitchers

Pitches like Houser: same hand, shape, slot and mix

Similarity	Player	Stuff	’26 WAR	’27 proj	2027
48	Stephen Kolek KC · ’97	90	0.5	1.0	Pre-arb
46	J.T. Ginn ATH · ’99	87	1.7	1.6	Pre-arb
44	Zebby Matthews MIN · ’00	92	0.7	1.1	—
44	Colin Rea CHC · ’90	96	0.4	0.4	Free agent
44	Trevor McDonald SF · ’01	93	0.7	1.1	—

Same-handed pitchers nearest on fastball velocity and shape, arm angle, extension, pitch mix, secondary shapes, Stuff, whiff rate and workload. 2026 regulars only.

Pitch locations · 2026

Where each pitch finishes, by batter side

Sinker 38%

50% zone

Four-seam 25%

45% zone

Changeup 22%

32% zone

Curveball 9%

39% zone

Slider 6%

41% zone

Where each pitch finishes, catcher’s view. The bar marks the batter’s side; the box is an average strike zone. Pitches with 40+ thrown to this side.

Contract & projection

Club control (RosterResource) · Keystone projected WAR

2027 0.7 WAR Guaranteed $11.0M

2028 0.4 WAR Club option $12.5M

2029 0.0 WAR Free agent

2030 −0.2 WAR Free agent

Contract Studio →

Minor leagues

MLB Stats API · public box-score data

SeasonLevel	Level	Team	Age	G	PA / IP	PA / IP ·Line
2025AAA	AAA	Round Rock Express	32	9	39.1 IP	39.1 IP · 5.03 ERA · 22.8% K · 9.3% BB