- Bats Left, Throws Left
- Height 6' 3", Weight 160 lb.
- High School Isabel Flores High School
- Debut August 13, 2014
He made his major league debut for Texas on August 13, 2014, in his fifth season in the Rangers' organization. he had moved around a lot during that time, as Texas was already his fourth stop of 2014, and he had also pitched for more than one team in both 2011 and 2013. He was used mainly as a reliever during his minor league apprenticeship, although he did start a total of 13 games out of 114 games, most of those starts coming in 2014 before the call to the Show. He was 6-3 with an excellent 1.66 ERA in 27 games when he arrived in the Lone Star State.
Claudio set a couple of club marks when he made his debut as a reliever in the 8th inning of a 10-1 blowout loss to the Tampa Bay Rays: he was the 56th different player used by the team that year, and the 34th pitcher. He pitched a perfect inning after arriving late at the ballpark, having only been called up after Yu Darvish was placed on the disabled list earlier that day, and he was expected to be sent down after the game to make way for the next day's starter, Robbie Ross. After his one inning of work, catcher J.P. Arencibia succeeded him on the mound to pitch the 9th in mop-up duty, upping the total number of pitchers used that year to 36 with 6 weeks still left to play. He ended up pitching 15 times for the Rangers, with no decisions and a 2.92 ERA in 12 1/3 innings. He had a similar stat line in 2015, when he pitched another 18 games in relief, and went 1-1 with an ERA of 2.87 in 15 2/3 innings.
In 2016, Claudio made a longer stint in the majors, getting into 39 games, and e continued to put up good numbers. In 51 2/3 innings, his ERA was 2.79 with a K/W ratio of 34-10 and a 4-1 record. he had his first full season in 2017, when he made 70 appearances, including 1 start. He had a chance to close some games after Sam Dyson imploded early in the season, and collected 11 saves, in addition to a 4-2 record. he had his best ERA this far, lowering it to 2.50. However, things did not go as well in 2018, as his ERA rose to 4.48 in 66 games. BUt he still had a 4-2 record and 1 save and walked just 13 in 68 1/3 innings. Following the season, on December 13th, he was traded to the Milwaukee Brewers in return for their Competitive Balance Round A pick in the 2019 amateur draft.
- T.R. Sullivan: "WBC '17 could prep Claudio for Rangers role: Lefty reliever likely to handle late innings for Puerto Rico", mlb.com, February 12, 2017.