He was signed as an international free agent by the Boston Red Sox in July 2005.[1] In 2006 with the DSL Red Sox of the Dominican Summer League, Álvarez was 2–1 with a 1.61 ERA and 64 strikeouts in 612⁄3 innings. In 2007 with the GCL Red Sox of the Gulf Coast League he was 4–1 with a 1.84 ERA (third in the league) and 38 strikeouts in 49 innings.[2][3] In 2008 with the Greenville Drive of the Single–A South Atlantic League he was 8–9 with a 5.70 ERA, and 86 strikeouts in 118 innings.[2]
In 2009, pitching for the Lowell Spinners in the Low–A New York-Pennsylvania League, Álvarez was a mid-season All Star, and ended the season 8–3 for the Spinners with a 1.52 ERA (3rd in the league, and tops in the Boston farm system), and 63 strikeouts in 83 innings.[2][4][3] He also pitched for the Salem Red Sox in the High–A Carolina League, and was 1–1 with a 4.74 ERA, and 11 strikeouts in 242⁄3 innings.[2]
In 2011, pitching for the Jupiter Hammerheads in the High–A Florida State League, Álvarez was a mid-season All Star, and ended the season 6–5 for the Hammerheads with a 2.96 ERA, with 73 strikeouts in 82 innings.[2][4] He was a two-time winner of the best changeup in the Florida Marlins farm system.[6]
In 2012 he pitched for the Jacksonville Suns in the Double–A Southern League. Álvarez was league Pitcher of the Week for the week ended June 25, and for the season was 6–9 with a 4.22 ERA, with 3 complete games (tied for the league lead), 1.66 walks per nine innings (tops among league starters), and 70 strikeouts in 1361⁄3 innings.[2][3]
Detroit Tigers (2012–14)
At the end of the 2012 season Álvarez was released, and he was picked up by the Detroit Tigers on November 8, 2012, as a minor league free agent.[3]
Álvarez was called up to the majors for the first time on June 9, 2013, and made his debut starting in place of Aníbal Sánchez.[9] He recorded a win and a quality start, pitching six innings while striking out seven against the Cleveland Indians.[8] He was sent back to the Toledo Mud Hens that same day[10] and was recalled June 20 to start again in place of Sánchez. On August 28, Alvarez was sent back to Toledo. In 2013 with the Tigers he was 1–5 with one save and a 5.82 ERA, with 31 strikeouts in 382⁄3 innings.[11] With Toledo, he was 8–6 with a 2.80 ERA (4th in the league), 5th in the league with a .235 batting average against and 1.79 walks per nine innings, and 115 strikeouts (10th) in 1282⁄3 innings.[11][3] He was named Detroit Tigers 2013 Minor League Pitcher of the Year.[3]Baseball America named him as having the best change up and control in the International League.[3]
Los Angeles Angels of Anaheim/Los Angeles Angels (2014–18)
In the winter of 2014–15 he pitched for the Caribes de Anzoategui of the Venezuelan Winter League, and was named Venezuelan Winter League Pitcher of the Year after leading the league in wins. Álvarez was 6–1 with two saves and a 1.91 ERA, with 40 strikeouts in 562⁄3 innings.[4][13]
Álvarez was called upon by the Angels 64 times in the 2015 season, posting a 4–3 record with a 3.49 ERA, and 59 strikeouts in 67 IP.[11] He was tied for sixth in the American League with 19 relief appearances of more than one inning pitched.[3]
In 2016, Álvarez made 64 appearances for the Angels. He registered a 1–3 record and an ERA of 3.45, with 51 strikeouts in 57+1⁄3 innings.[11]
Álvarez made 64 appearances for the third straight season in 2017 for the Angels, registering an 0–3 record with one save and an ERA of 3.88 and 45 strikeouts in 48+2⁄3 innings.[11] Among left-handed relief pitchers, his 83% stranded rate was 6th in the major leagues (minimum 30 innings).[3] Lefthanders batted .245/.252/.462 against him, with one walk and 26 strikeouts.[14]
In 2018, Álvarez was 6–4 with one save and posted career bests in games (76; 2nd-most in the American League), wins (6), and ERA (2.71; 4th among left-handed AL relievers), and tied his career high with 59 strikeouts.[11][15] He allowed three home runs over 63 innings, and limited left-handed batters to batting .206/.265/.338 against him with nine walks and 34 strikeouts.[15][16][17] He was 5th among all MLB relievers, stranding 86.0% of inherited runners.[3]
Philadelphia Phillies (2019–20)
On December 6, 2018, Álvarez was traded to the Philadelphia Phillies, for relief pitcher Luis Garcia.[15] Alvarez made his first start in five years on June 1, 2019, as the Phillies' opener against the Los Angeles Dodgers. In 2019 with the Phillies he was 3–4 with one save and a 3.36 ERA, as he pitched in 67 games (one start) over 59 innings.[18]
In 2020, during an August 20 game against the Toronto Blue Jays, Alvarez was struck in the groin by a line drive hit, leading to an injury that caused him to be inactive for the remainder of the season.[19] In 2020 he was 0–0 with a 1.42 ERA in 61⁄3 innings in which he struck out 6 batters over eight games.[11]
San Francisco Giants (2021–2022)
On March 6, 2021, Álvarez signed a one-year, $1.15 million contract with the San Francisco Giants, that included a $1.5 million club option for 2022.[20]
In the 2021 regular season, Álvarez was 5–2 with a career-best 2.37 ERA in 67 games (1 start), in which he pitched 642⁄3 innings and allowed 7.4 hits per 9 innings pitched.[11]
In 2022, Álvarez made 21 appearances for San Francisco, posting a 2–1 record and 5.28 ERA with 15 strikeouts in 15.1 innings pitched. He was placed on the injured list in early July with left elbow inflammation. On September 2, 2022, Álvarez underwent Tommy John surgery, ending his 2022 and 2023 seasons.[21]
Detroit Tigers (second stint) (2023)
On March 22, 2023, Álvarez signed a minor league contract with the Detroit Tigers organization. He was optioned to Triple-A Toledo to begin the year,[22] but spent the entire season on the injured list as he recovered from surgery. Álvarez was released by the Tigers organization on January 31, 2024.[23]
Toros de Tijuana (2024–present)
On June 9, 2024, Álvarez signed with the Toros de Tijuana of the Mexican League.[24] In 18 games for Tijuana, he posted an 0–1 record and 1.17 ERA with 12 strikeouts across 15+1⁄3 innings pitched.
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