Standard MLB Batting Statistics

No MLB Hitting Statistics.

Standard MLB Pitching Statistics

	Season	Tm	LG	BF	W	L	ERA	G	GS	SV	IP	H	R	ER	HR	BB	SO	WHIP
	2024	AZ	NL	119	1	1	3.81	7	4	0	28.1	27	13	12	3	12	19	1.38
	2025	AZ	NL	15	0	0	9.00	1	0	0	3.0	4	3	3	0	3	1	2.33
	2026	AZ	NL	10	0	0	94.50	1	0	0	0.2	7	7	7	1	1	0	12.00
	3 Seasons	AZ	NL	144	1	1	6.19	9	4	0	32.0	38	23	22	4	16	20	1.69

*: All Star Season, Rankings AL/NL: Top 5 10 15 20,        Click for Chart.

Standard MLB Fielding Statistics

Season	Tm	LG	POS	G	GS	INN	TC	PO	A	E	DP	RF	FPCT%
2024	AZ	NL	P	7	4	28.1	2	0	1	1	0		.500
2025	AZ	NL	P	1	0	3.0	1	1	0	0	0		1.000
2026	AZ	NL	P	1	0	0.2	0	0	0	0	0		.000
3 Seasons	AZ	NL	P	9	4	32.0	3	1	1	1	0		.667

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Scouting Report

Scouting grades: Fastball: 60 | Curveball: 60 | Slider: 60 | Control: 35 | Overall: 40

Just a $10,000 signing out of Venezuela in February 2021, Díaz entered 2025 as Arizona’s top pitching prospect and then had one of the most volatile seasons of any prospect. After debuting in The Show in 2024, he got another taste of the Majors with one relief outing on April 25, then moved back to Triple-A Reno and walked 16 batters in his next three starts. The D-backs sent him to their complex, and he moved to the bullpen for good afterward. With control issues still bugging him, Díaz was demoted to Double-A Amarillo in August but found more success late with 11 strikeouts and only two free passes over a stretch of eight scoreless appearances. Díaz continued to steady himself in the Venezuelan Winter League as the closer for the Caribes de Anzoátegui.

There’s no doubting the quality of Díaz's stuff. He can flirt with triple digits on his fastball, especially now that he’s working in shorter stints, and he tends to live around 95-98 mph. There are a pair of really good breaking balls here too with a mid-80s gyro slider and an upper-70s knuckle curve that each provide a nice change of pace and different types of break -- the slider offering minimal horizontal movement, while the deuce shows more drop and a little more sweep. He lacks a changeup and has rough lefty splits to match.

When things went wrong for Díaz, he was throwing several uncompetitive heaters above the zone and disciplined upper-level hitters weren’t biting. The D-backs believe it was a matter of intent and that the right-hander needed to get back to a mentality of living in the zone and trusting his stuff. He still has the arsenal of a high-quality reliever but needs the control improvements to stick to be trusted in high-leverage moments.

Scouting grades: Fastball: 60 | Curveball: 60 | Slider: 65 | Changeup: 40 | Control: 40 | Overall: 45

Signed for only $10,000 out of Venezuela as a 20-year-old in February 2021, Diaz has slowly built himself into the top pitching prospect in the Arizona system. His breakout campaign came in 2023 when he struck out 140 over 102 2/3 innings between High-A and Double-A, and last season, he solidified his standing with dominant runs at Amarillo and Triple-A Reno and a Major League debut in the Arizona rotation in July. Diaz also got late looks in the Triple-A and MLB bullpens. He finished with a 3.80 ERA and 159 strikeouts in a career-high 132 2/3 innings across all levels.

The 6-foot right-hander continued to show stellar velocity despite the increased workload, touching 99 mph while primarily sitting 95-97. It found a little too much of the zone in the Majors and was hittable there, but it plays enough armside to stick as a plus pitch. Diaz’s best offering in terms of avoiding contact has been his 83-86 mph gyro slider, a pitch with sharp 12-to-6 action that he lands like a dart. It had a 51 percent whiff rate across all levels and was a force against batters from both sides. His 78-81 mph knuckle curve offered another breaker with even steeper drop and a little more gloveside action. Diaz threw all of two changeups between Triple-A and the Majors, in part because his breaking stuff played so well against lefties.

Diaz is an athletic mover on the bump, and his control has slowly improved in pro ball. His 8.5 percent walk rate at Triple-A (while using the MLB ball) was a career low. The D-backs tried him out of the bullpen because they liked his stuff, but he has the arsenal to be a solid starter.

Scouting grades: Fastball: 65 | Curveball: 55 | Slider: 60 | Changeup: 40 | Control: 45 | Overall: 50

Diaz signed with the D-backs for only $10,000 as a 20-year-old Venezuela native in February 2021, and within three years, he’s carved out a prominent role for himself in the Arizona farm system. The right-hander eclipsed the century mark in innings last season, spending most of the campaign with High-A Hillsboro before getting a late cameo with Double-A Amarillo. His 31.8 percent strikeout rate ranked ninth among 272 Minor Leaguers with at least 100 frames, but his 4.82 ERA and 1.34 WHIP took some of the shine off.

Diaz has pushed from Double-A to Triple-A to even getting looks in the Majors, thanks to a continually refined arsenal. His fastball touches 99 mph, averages around 96 and comes with ample zip up in the zone. His 82-85 mph slider was much improved in 2023 and has become his most relied upon secondary offering in ’24 -- a two-plane breaker that batters just can’t handle. His upper-70s knuckle curve gives him another dropper that plays off the high heat and gives him an option against lefties. He rarely, if ever, uses a low-80s changeup these days.

The 6-foot right-hander’s control has been solidly improved at the upper levels this summer, and while there’s still effort in his delivery, he’s throwing enough strikes to remain in a starting role. The D-backs gave Diaz MLB looks before he became Rule 5-eligible this offseason, and while there’s still some refining needed, he should be a serious consideration for the rotation moving forward.

Scouting grades: Fastball: 65 | Curveball: 55 | Slider: 50 | Changeup: 50 | Control: 40 | Overall: 45

Diaz signed with the D-backs late for an international player as a 20-year-old out of Venezuela in February 2021, doing so for just $10,000. He went to the Dominican Summer League that season and walked more batters (18) than he struck out 17) in 26 1/3 innings as a reliever. Arizona still felt like there were the makings of a starter and got aggressive with the righty in his age-21 season, bumping him straight to Single-A Visalia, where that confidence was rewarded. Diaz struck out 99 batters and posted a 4.06 ERA over 77 2/3 innings between the California and Northwest Leagues.

Diaz has steadily gained velocity since joining pro ball and now averages 94-97 mph while flirting with triple digits. The heater bursts out of his hand and rides well to the top of the zone, making low-level hitters look foolish. He’s worked on adding a little extra velo to his curveball (it’s now in the upper 70s), as well as some sharpness, and that should end up being his best secondary the more he throws it. A more horizontal slider and average changeup give Diaz additional options.

Standing just 6 feet tall on the mound, Diaz can look like he’s overthrowing at times, and his command becomes scattershot as a result. The D-backs believe fatigue played a factor in his walk rate jumping at High-A, but it’s still not clear how the control will play against more patient upper-level hitters. Diaz’s velocity gives him a solid floor as a reliever.

Awards

Baseball America Triple-A All-Star

Year	Team
2024

PCL Pitcher of the Week

Week	Team
07/07/2024

TEX Pitcher of the Week

Week	Team
05/26/2024
05/05/2024

NWL Pitcher of the Week

Week	Team
09/03/2023

Transactions

Team	Date	Transaction
	06/21/2026	Arizona Diamondbacks designated RHP Yilber Díaz for assignment.
	06/19/2026	Arizona Diamondbacks recalled RHP Yilber Díaz from Reno Aces.
	03/05/2026	Arizona Diamondbacks optioned RHP Yilber Díaz to Reno Aces.
	03/05/2026	Arizona Diamondbacks optioned RHP Yilber Díaz to Reno Aces.
	03/05/2026	RHP Yilber Díaz assigned to Arizona D-backs Prospects.
	10/25/2025	RHP Yilber Díaz assigned to Caribes de Anzoategui.
	09/29/2025	Arizona Diamondbacks recalled RHP Yilber Díaz from Amarillo Sod Poodles.
	08/01/2025	RHP Yilber Díaz assigned to Amarillo Sod Poodles from Reno Aces.
	06/10/2025	RHP Yilber Díaz assigned to Reno Aces from ACL D-backs.
	05/23/2025	RHP Yilber Díaz assigned to ACL D-backs from Reno Aces.
	04/27/2025	Arizona Diamondbacks optioned RHP Yilber Díaz to Reno Aces.
	04/27/2025	Reno Aces activated RHP Yilber Díaz.
	04/25/2025	Arizona Diamondbacks recalled RHP Yilber Díaz from Reno Aces.
	03/10/2025	Arizona Diamondbacks optioned RHP Yilber Diaz to Reno Aces.
	10/01/2024	Arizona Diamondbacks recalled RHP Yilber Diaz from ACL D-backs.
	09/26/2024	Arizona Diamondbacks optioned RHP Yilber Diaz to ACL D-backs.
	09/12/2024	Arizona Diamondbacks recalled RHP Yilber Diaz from Reno Aces.
	08/15/2024	Reno Aces activated RHP Yilber Diaz from the 7-day injured list.
	08/07/2024	Reno Aces placed RHP Yilber Diaz on the 7-day injured list.
	07/29/2024	Arizona Diamondbacks optioned RHP Yilber Diaz to Reno Aces.
	07/08/2024	Arizona Diamondbacks selected the contract of RHP Yilber Diaz from Reno Aces.
	06/11/2024	RHP Yilber Diaz assigned to Reno Aces from Amarillo Sod Poodles.
	03/07/2024	Arizona D-backs Prospects activated RHP Yilber Diaz.
	09/05/2023	RHP Yilber Diaz assigned to Amarillo Sod Poodles from Hillsboro Hops.
	09/05/2023	Amarillo Sod Poodles activated RHP Yilber Diaz.
	07/26/2022	RHP Yilber Diaz assigned to Hillsboro Hops from Visalia Rawhide.
	05/11/2022	RHP Yilber Diaz assigned to Visalia Rawhide from DSL D-backs1.
	02/05/2021	Arizona Diamondbacks signed free agent P Yilber Diaz.
	02/05/2021	RHP Yilber Diaz assigned to DSL D-backs1.