AZ · P

Jonathan Loáisiga

Age 31 B/T R/R 5′11″, 195 lb Nicaragua MLB debut 2018

40-man

Free agent est. 1 yr × $5.0M ($2M–$10M) · +0.2 wins to Pittsburgh’s Winter Plan in the bullpen

Keystone Stuff 97 38th pct

2026 fWAR 1.1

Projected 2027 WAR 0.4 Keystone Marcel+ at 66 IP

Pitching · 2026 percentiles

vs. MLB pitchers with 500+ pitches · 962 pitches

Keystone Stuff 97

Keystone Location 114

Keystone Pitching 112

Run value (xRV) +1.16

Strikeout % 18.4%

Walk % 5.0%

Whiff % 23.1%

Chase % 35.9%

Fastball velo 97.8

Extension 6.4 ft

67.0 IP2.42 ERA2.88 FIP 42° arm2 SV

Arsenal & Pitch Lab

Movement normalized to arm side · Keystone Stuff by pitch

RHP · arm angle 42° · how to read

Pitch	Use	Velo	IVB	HB	Stuff	Loc	Whiff	xRV/100
Sinker35% use	35%	97.9	7.3	+16.9	104	113	17%	+2.86
Changeup27% use	27%	91.0	5.2	+16.7	94	104	32%	+0.24
Four-seam16% use	16%	97.6	13.2	+9.5	82	102	19%	+0.43
Curveball15% use	15%	89.5	0.8	−3.9	111	109	26%	−0.02
Cutter7% use	7%	95.8	9.2	+2.5	90	120	22%	+0.41

No mix change or new pitch clears its bar. The arsenal is efficient for its shapes.

Most similar pitchers

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

Similarity	Player	Stuff	’26 WAR	’27 proj	2027
55	Huascar Brazobán CWS · ’89	91	0.7	0.2	Arb
50	Lucas Erceg KC · ’95	98	−0.5	0.3	Arb
47	Taylor Clarke AZ · ’93	86	0.5	0.3	Free agent
47	Alex Lange KC · ’95	85	−1.1	−0.5	Arb
37	Enyel De Los Santos HOU · ’95	98	0.3	0.1	Free agent

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

Changeup 45%

31% zone

Four-seam 24%

39% zone

Sinker 16%

55% zone

Cutter 11%

55% 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 0.4 WAR Free agent

2028 0.3 WAR Free agent

2029 0.1 WAR Free agent

2030 0.0 WAR Free agent

A pending free agent: no club controls his 2027. Contract Studio →

Minor leagues

MLB Stats API · public box-score data

SeasonLevel	Level	Team	Age	G	PA / IP	PA / IP ·Line
2025A	A	Tampa Tarpons	30	3	3.1 IP	3.1 IP · 2.70 ERA · 58.3% K · 0.0% BB
2025AAA	AAA	Scranton/Wilkes-Barre RailRiders	30	4	5 IP	5 IP · 0.00 ERA · 17.6% K · 5.9% BB