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Luis Curvelo

Rangers Place Jacob Webb On 15-Day IL, Promote Luis Curvelo

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The Rangers placed right-hander Jacob Webb on the 15-day injured list (retroactive to July 29) due to back spasms.  Righty Luis Curvelo was called up from Triple-A in the corresponding move, as initially reported earlier today by Daniel Alvarez-Montes of El Extra Base.  Curvelo was already on the 40-man roster, so no additional roster move was necessary.

Signed to a one-year, $1.25MM free agent deal last winter, Webb has provided steady work out of the Texas bullpen this year, with a 3.75 ERA over 48 innings.  His 19.5% strikeout rate is the lowest of his six MLB seasons, and a .232 BABIP has helped Webb outperform his 4.15 SIERA.  Still, there isn’t a big gap between Webb’s real-world numbers and his expected numbers, as he has done an outstanding job of inducing soft contact.  The righty’s seven percent walk rate is also a personal best.

Losing Webb for at least the next two weeks won’t help a Rangers team that is fighting for a playoff berth, especially since Chris Martin was also put on the IL due to a calf strain last week.  The Texas relief corps has been very impressive overall this year, but the Rangers are known to be looking for high-leverage relievers to try and bring a steady closer into the mix before tomorrow’s trade deadline.

Curvelo’s first in-game appearance will mark the 24-year-old’s big league debut.  Despite his young age, Curvelo is in his seventh season of pro ball, as he started as a 17-year-old in the Mariners’ system in 2017.  He joined the Rangers this past winter on a Major League contract, speaking to the amount of interest Curvelo generated despite his lack of MLB experience.

Curvelo made his Triple-A debut this season and has a 3.26 ERA, 23.5% strikeout rate, and 10.6% walk rate over 38 2/3 innings with Round Rock.  These aren’t the kind of special numbers that it would take to get a relief-only pitcher onto a team’s top prospects list, yet Curvelo has looked good enough against Triple-A batters that he’ll now get his first chance to show his wares at the MLB level.  It remains to be seen if Curvelo will just get a cup of coffee in the majors or if he’ll get a longer look if he pitches well, considering that the Rangers’ bullpen situation could be quite different after tomorrow.

Rangers To Recall Luis Curvelo For MLB Debut

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The Rangers are planning to recall right-hander Luis Curvelo for his MLB debut, reports Daniel Álvarez Montes of El Extra Base. Curvelo is on the 40-man roster after signing a big league deal in free agency this offseason and was optioned to Triple-A this spring (hence this technically being a “recall” despite never having pitched in the majors).

Curvelo, 24, originally signed with the Mariners out of Venezuela as a teenager during the 2017-18 international signing period. He became a minor league free agent this past offseason and landed a major league deal with Texas after having pitched to a 2.57 ERA with a 30.6% strikeout rate and 7.1% walk rate in Double-A last year.

So far in 2025, Curvelo has continued down that impressive trajectory. In his first crack at the Triple-A level, the 6’1″ righty has logged 22 innings with a pristine 1.64 earned run average, a 26.9% strikeout rate and a 7.5% walk rate. He’s been an extreme fly-ball pitcher in the past but is currently carrying a better-than-average 44.6% ground-ball rate. Curvelo is averaging 95.5 mph on his four-seamer and 95.0 mph on a sinker this year, but he’s thrown his 84.2 mph slider at a nearly 55% clip — far and away the most frequently used offering in his three-pitch repertoire.

Prior to the 2025 season FanGraphs’ Eric Longenhagen credited Curvelo with a 70-grade slider (on the 20-80 scale) but a 45 fastball that “plays down” due to the right-hander’s sub-par command. Outside of a rough 2022 season in High-A, Curvelo has never had much trouble throwing strikes — but he’s struggled at times with his precision/command within the strike zone.

Curvelo will be the second fresh arm added to manager Bruce Bochy’s relief corps for this weekend series against the Nationals. Veteran righty Chris Martin was just reinstated from the 15-day injured list last night. Texas optioned righty Kumar Rocker to Triple-A Round Rock to clear a roster spot for Martin’s return. They’ll need to open a second spot for Curvelo.

Rangers Sign Luis Curvelo To Major League Contract

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November 13: The Rangers made it official today, announced they signed Curvelo to a major league deal. Their 40-man roster count climbs to 37.

November 10: The Rangers are closing in on a deal with right-handed reliever Luis Curvelo, reports Jon Morosi of MLB Network. It will be a major league contract for the 24-year-old hurler.

Earlier this month, Morosi reported that Curvelo was “one of the most popular free agents” at the annual GM Meetings in San Antonio. To be clear, that doesn’t necessarily mean that teams preferred Curvelo to any of the top relievers on the market. More likely, it means they viewed him as a low-risk, high-reward target who could provide meaningful innings at a fraction of the price of a proven big league pitcher.

The Venezuela native signed with the Mariners as an international free agent in 2018 and worked his way up to Double-A Arkansas in 2024. Over 49 games (66 2/3 IP) this past season, he produced the best numbers of his career to date, pitching to a 2.57 ERA and 3.03 FIP. An unusually low 7.8% home run-to-fly ball ratio and an unsustainable .227 BABIP are signs that he’s due for some regression, but even so, it’s hard not to be impressed by his performance – especially his 30.6% strikeout rate.

Curvelo has been a full-time reliever since his age-18 season, which partially explains why he was never a highly-ranked prospect in Seattle’s system. However, Eric Longenhagen of FanGraphs liked what he saw enough to rank Curvelo as the no. 31 prospect in the Mariners organization this past July. Longenhagen was unconvinced by the righty’s fastball but had nothing but praise for his slider. For what it’s worth, Curvelo was even better from July onward, putting up a 1.86 ERA, a 2.44 FIP, and a 33.6% strikeout rate over his final 29 innings pitched.

As for why Seattle would let Curvelo walk after such a strong season? He was eligible for minor league free agency this offseason, and the Mariners would have had to add him to their 40-man roster to prevent him from leaving. Morosi suggests they simply didn’t have space on the 40-man, and evidently, they weren’t willing to make space either. The Rangers currently have four open spots on the 40-man, giving them plenty of room to add Curvelo to the mix. There’s a good chance he’ll begin the 2025 campaign at Triple-A Round Rock (he still has all of his minor league options remaining), but presumably, Texas is hoping he’ll play a role in the big league bullpen at some point next year.

By almost every metric, the Rangers’ bullpen was one of the worst in the league this past season. Collectively, Texas relievers ranked 26th in ERA, 23rd in SIERA, and 25th in FanGraphs WAR. To make matters worse, those poor numbers came in spite of phenomenal performances from veterans Kirby Yates and David Robertson, both of whom are now free agents. So are swingman José Ureña and Rangers bullpen mainstay José Leclerc. If this team is planning to get back into contention in 2025, and there’s no reason to think they aren’t, the bullpen is an obvious area for improvement. However, owner Ray Davis is reportedly hoping to get back under the $241MM luxury threshold, which means president of baseball operations Chris Young will have limited funds at his disposal. Thus, it makes perfect sense that Young would target the relatively inexpensive upside of Curvelo.

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