Estibenzon “Jimmy” Jimenez is a 24-year-old, 6′ 1″, 172 pound right-handed pitcher from San Felipe, Venezuela. Jimenez made 28 relief appearances with Reading in 2026 and went 5-0 with seven saves in seven opportunities. In 31.2 innings he posted a 2.84 ERA, A 1.29 WHIP and opponents hit just .224 against him. He issued 13 walks and struck out 36 batters.
The Phillies signed Jimenez as an international free agent in 2019 when he was 17, giving him a bonus of just $10,000. The fact that Jimenez was a low profile player allowed the Phillies to sign him for a very modest bonus and it appears he could be on his way to making that look like a great deal. Unfortunately for Jimenez, COVID canceled his 2020 pro debut for a year.
Minor League Career
Jimenez’ debut in 2021 came with the Dominican Summer League Phillies White team and was excellent. He went 6-0 with a 1.59 ERA over 16 games, three of them starts, and struck out 41 in 45 1/3 innings while allowing only 24 hits.
In 2022 he came stateside to the Florida Complex League, working mostly as a bulk reliever and swingman, with a 2.29 ERA in 12 games, earning him two late-season starts with Single-A Clearwater and he allowed just three runs in nine innings with 12 strikeouts, and was named Florida State League Pitcher of the Week during September.
The Phillies moved him into the Clearwater rotation full time in 2023. He went 4-8 with a 3.60 ERA over 21 games (19 starts), striking out 78 and walking 39 in 90 innings. His best outing was a career-high seven shutout innings at Jupiter that July. Evaluators noted that he found an extra gear during the Threshers’ postseason run.
Jimenez didn’t build off of his 2023 season and 2024 turned into a low point. Pitching for High-A Jersey Shore, he went 4-11 with a 7.02 ERA. Opponents piled up 104 hits in 82 innings, and his WHIP ballooned to 1.66. He still struck out 85, though, which hinted that the raw stuff hadn’t gone anywhere.
He rebuilt his confidence that winter with the Adelaide Giants in the Australian Baseball League, posting a 2.77 ERA with 44 strikeouts against only four walks in 26 innings. That carried into 2025, when he split time between Jersey Shore (5.09 ERA in 14 games) and Double-A Reading, where he made 13 starts with a 3-4 record and a 4.63 ERA. Across 123 innings that season he walked only 34 batters, but he gave up 20 home runs.
Then came 2026 and the move that changed everything. After making 60 starts over his first five seasons, he didn’t start a single game. Working strictly in relief across four levels, he went 7-0 with a 2.38 ERA, 51 strikeouts in 45.1 innings, and a perfect seven-for-seven in save chances. Most of that came in his time with Reading. He got stronger as the year went on, with a 2.42 ERA after the All-Star break. He also pitched in three of Reading’s four playoff games, saved Game 1 of the Eastern League Championship Series, and struck out the final batter to clinch Reading’s first championship in more than 30 years.
His career minor league line now stands at 31-27 with a 4.14 ERA in 140 games, with 420 strikeouts in 430 innings.
What the Numbers Say About His Strengths and Weaknesses
The advanced numbers tell a clear story about why the bullpen move worked. As a starter, his biggest problem was the long ball. He allowed home runs at a rate of about 1.5 per nine innings in 2025, and one respected Phillies prospect analyst described him heading into this season as flyball prone, with no pitch that got swings and misses at a high enough rate for success. That analyst ranked him only 48th in the system and projected him as a sixth starter or middle reliever.
Out of the bullpen, almost all of that flipped. His strikeout rate jumped to 26 percent, or 10.1 per nine innings. His home run rate was cut by more than half, to 0.6 per nine and opponents hit only .207 against him. Fielding Independent Pitching (FIP), which estimates what a pitcher’s ERA should be based only on the things he controls – strikeouts, walks and homers – comes out to 3.1, so his 2.38 ERA was helped by a little good fortune but was backed up by solid underlying work.
He also handled hitters from both sides well, holding lefties to a .212 average and righties to .204. That matters because many relievers struggle against one side or the other. Jimenez also showed strong numbers when the game was on the line by holding hitters to just a .115 average with runners in scoring position.
There are two areas to watch. First, his walk rate crept up as a reliever, to about four per nine innings, compared with roughly 2.5 per nine as a starter in 2025. Second, and more striking, he has struggled with the very first batter of an inning. Leadoff hitters batted .457 against him this year. Once he settles in, he becomes very hard to hit, but those slow starts put runners on base before he finds his rhythm. Cleaning that up could be the difference between a good Double-A closer and a trusted big league setup man.
The Repertoire
The move to relief brought a real jump in velocity. His four-seam fastball that had been around 92 mph was pumped up to 94 mph and occasionally as high as 98. His slider got harder too, and is in the upper 80s, with it producing a whiff rate of about 39 percent this season. MLB Pipeline noted that he loves throwing it, which suggests it has become his go-to pitch. Jimenez also has a deceptive changeup and a newly added sweeper.
Injury History
Jimenez has not had any major injury issues, but has experienced some minor issues, including spending three weeks on the injured list at Clearwater early in 2023.
The most significant setback came this spring, when shoulder soreness landed him on the IL. He missed all of April, made rehab appearances with the Florida Complex League, Clearwater and Jersey Shore in May, and rejoined Reading in early June. Ironically, that injury may have helped his career. It coincided with his full-time move to the bullpen, where shorter outings let him throw harder and lean on his best pitches. The shoulder issue is still worth keeping an eye on, since he hasn’t yet handled a full season of high-velocity relief work.
The Bottom Line
Jimenez is a classic example of a starter who found his true calling in the bullpen. A $10,000 signing who once looked like organizational depth now has a 95-plus mph fastball, a sharp slider that misses bats, and a championship-clinching strikeout on his résumé. If he can limit the walks, figure out how to get the first hitter of the inning out more consistently, and stay healthy, he has a real chance to follow former Clearwater teammate Alex McFarlane into the Phillies’ bullpen, possibly as soon as 2027.
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