Players · M · Pitcher · 2026

Juan Mejia

Age: 26
B/T: R/R
Height: 6' 3"
Weight: 210 lb
Number: #47

Born: July 4, 2000 in Santo Domingo, Dominican Republic
MLB debut: April 24, 2025

dbWAR: 1.4
IP: 70.0
ERA: 5.27
FIP: 4.17
K/9: 8.5
FIP−: 100

Juan Mejia is a relief pitcher for the Colorado Rockies. In 2026 he struck out 66 batters over 70.0 innings across 65 appearances, going 4-6. His ERA of 5.27 is 26.2% higher than the league average of 4.18 — 8th of 21 on his team, and 427th of 538 among MLB pitchers with 20+ innings. Stripping out defence, his 4.17 FIP suggests he pitched better than his ERA shows. He missed bats on 23.7% of swings (11.1% of every pitch he threw), walked 12.4% of the batters he faced and struck out 20.4%. His 0.5 dbWAR is built from that FIP rather than runs allowed, so it credits him for what he controls and not for the defence behind him.

League context

Percentile among qualified pitchers, 2026.

FIP4.17

K/98.5

WHIP1.69

WAR.5

WAR by season

Pitching

Standard and advanced, by season.

																				Trend
2026	COL	65	1	70.0	4	6	4	78	41	66	40	5.27	4.17	1.69	8.5	5.1	126	100	0.5
2025	COL	55	0	61.1	2	2	1	52	27	68	25	3.96	3.71	1.26	10.0	3.7	95	89	0.9

Platoon splits

How left- and right-handed hitters fare against him.

Season

Opponent batting by the side the hitter bats from, 2026. Counted from play-by-play, so totals can differ from the box-score season line by a plate appearance or two.
Split	PA	AB	H	HR	BB	SO	AVG	OBP	SLG	wOBA	K%
vs LHB	165	143	49	6	18	38	.343	.421	.545	.416	23.0%
vs RHB	158	131	29	0	22	28	.221	.333	.237	.278	17.7%

Pitch sequencing

What Juan Mejia throws in each count, and what he follows each pitch with. Select any cell for the breakdown.

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Four-seamSweeperSinkerChangeupSlider

Select a count to see exactly what Juan Mejia throws in it.

Pitch arsenal

What he throws, how hard, how often it misses, and what hitters do with it.

Season


Four-Seam Fastball	53.8%	701	96.9	2,462	44.1%	17.9%	152	.355	.900
Sweeper	37.6%	490	83.9	2,869	51.0%	32.7%	103	.194	.601
Sinker	4.6%	60	96.0	2,489	55.0%	18.8%	13	—	—
Changeup	2.1%	27	93.2	2,062	40.7%	20.0%	4	—	—
Slider	1.9%	25	87.9	2,859	40.0%	36.4%	4	—	—

Juan Mejia's arsenal by usage. Velocity is average release speed in mph, spin in rpm, and whiff rate is misses per swing — the cleanest single measure of whether a pitch beats hitters. BAA and OPS are what hitters did against each pitch, credited to the one that ended the plate appearance, and are left blank under 15 at-bats.

Head to head

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Similar players

Nearest 2026 seasons by command, run prevention and role, on rate statistics rather than totals.

Taylor RogersMIN

ERA: 4.40
FIP: 4.23
SO: 53
WAR: 0.3

Very close

Jaden HillCOL

ERA: 5.35
FIP: 4.16
SO: 38
WAR: 0.3

Very close

Isaac MattsonPIT

ERA: 5.35
FIP: 3.72
SO: 36
WAR: 0.5

Very close

Sam MollCIN

ERA: 4.79
FIP: 4.18
SO: 56
WAR: 0.3

Very close

How these are computed

wOBA uses linear weights measured from this season's own play-by-play rather than published constants, and wRC+ is park-adjusted against that same league. dbWAR is our own open implementation — not fWAR or bWAR — and the full derivation, including its simplifications, is on the methodology page.