Born: December 25, 1995
Height: 6’3″
Weight: 235
Bats: Right
Throws: Right
Signed: International Free Agent, 2014 (Mariners)
How Acquired: Waiver Claim (from Phillies)
Country: Dominican Republic
Agent: Octagon
De Los Santos came up through the minors quickly as a well regarded prospect, but so far he hasn’t been successful in the majors.  He was a starter in the minors until 2021, but appears destined for relief now.  He throws hard, averaging about 95 mph in 2021, but he’s had trouble throughout his career in developing secondary pitches.  He throws a slider and change, but neither has been a good pitch.  That’s probably reflected in his minor league K rates, which weren’t impressive until 2021.  The Pirates picked him up, like they do nearly all their relievers, on a waiver claim.

R:  3-0-0, 2.55 ERA, 1.18 WHIP, 24.2 IP, 1.8 BB/9, 10.6 K/9
A-:  3-0-0, 4.06 ERA, 1.33 WHIP, 37.2 IP, 3.1 BB/9, 10.0 K/9

After signing, De Los Santos added velocity and Seattle brought him straight to the US.  Pitching as a starter, he had little trouble in rookie ball and was generally effective after moving up to short season ball.  After the season, Seattle sent him to San Diego in a trade for Joaquin Benoit.  Baseball America rated him 15th in San Diego’s system.

A:  3-2-0, 2.91 ERA, 0.99 WHIP, 52.2 IP, 2.4 BB/9, 7.7 K/9
A+:  5-3-0, 4.35 ERA, 1.38 WHIP, 68.1 IP, 3.2 BB/9, 6.8 K/9

De Los Santos split the season between low A and high A.  His K rate dropped off, but he was very effective in low A and did well in high A considering that he was in the high-offense California League.  BA ranked him 17th in a rapidly improving Padres’ system.

AA:  10-6-0, 3.78 ERA, 1.19 WHIP, 150.0 IP, 2.9 BB/9, 8.3 K/9

De Los Santos had another good season, spending all of it in AA.  BA ranked him 18th with the Padres.  After the season, though, they sent him to the Phillies for Freddy Galvis.

AAA:  10-5-0, 2.63 ERA, 1.16 WHIP, 126.2 IP, 3.1 BB/9, 7.8 K/9
MLB:  1-0-0, 4.74 ERA, 1.42 WHIP, 19.0 IP, 3.8 BB/9, 7.1 K/9

The Phillies sent De Los Santos to AAA and he had a strong season.  He got called up briefly in July and August, then came back in September.  He made two starts and five relief appearances in the majors at age 22 and pitched respectably.  BA rated him sixth in the Philadelphia system.

AAA:  5-7-0, 4.40 ERA, 1.23 WHIP, 94.0 IP, 3.4 BB/9, 7.9 K/9
MLB:  0-1-0, 7.36 ERA, 1.64 WHIP, 11.0 IP, 4.1 BB/9, 7.4 K/9

De Los Santos was up and down between AAA and the majors several times early in the season, but made his last appearance with the Phillies in late June.  He wasn’t as effective in AAA, with gopher balls — 16 of them — becoming a problem.  He got into just five games in the majors and gave up four homers in 11 innings.  BA rated him eighth in the Phillies’ system.


The Phillies sent De Los Santos to their alternate training facility and called him up briefly, but he didn’t get into a game.  They outrighted him in August.

AAA (Phi):  0-1-0, 2.70 ERA, 0.60 WHIP, 13.1 IP, 3.4 BB/9, 16.2 K/9
MLB (Phi):  1-1-0, 6.75 ERA, 1.71 WHIP, 28.0 IP, 4.5 BB/9, 13.5 K/9

The Phillies called De Los Santos back up and he opened the season with them in early May.  He was up and down a couple times, then stayed mostly with the Phillies starting in late June.  His K rate increased sharply and he pitched very well in AAA, but he got hit hard in the majors, including seven home runs in just 28 innings.  The Phillies designated him for assignment in mid-September and the Pirates claimed him.

The Pirates have come to rely almost exclusively on the waiver wire for building their bullpen, a strategy that’s produced very little value.  De Los Santos is younger than their typical waiver claim, so maybe there’s some potential for improvement.  He has no options left after 2021.

2021: Major League Minimum
Signing Bonus: $15,000
MiLB Debut: 2015
MLB Debut: 7/10/2018
MiLB FA Eligible: N/A
MLB FA Eligible: 2027
Rule 5 Eligible: N/A
Added to 40-Man: 11/18/2016
Options Remaining: 0 (USED:  2018, 2019, 2021)
MLB Service Time: 1.006
July 17, 2014: Signed as an international free agent by the Seattle Mariners.
November 12, 2015: Traded by the Seattle Mariners with Nelson Ward to the San Diego Padres for Joaquin Benoit.
December 15, 2017: Traded by the San Diego Padres to the Philadelphia Phillies for Freddy Galvis.
July 10, 2018: Contract purchased by the Philadelphia Phillies.
August 14, 2020: Outrighted to alternate training site by the Philadelphia Phillies.
May 4, 2021: Called up by the Philadelphia Phillies.
September 12, 2021: Designated for assignment by the Philadelphia Phillies.
September 13, 2021: Claimed off waivers from the Philadelphia Phillies by the Pittsburgh Pirates.