Zachary Adams Eflin (born April 8, 1994) is an American professional baseball pitcher for the Baltimore Orioles of Major League Baseball (MLB). He has previously played in MLB for the Philadelphia Phillies and Tampa Bay Rays.
The San Diego Padres selected Eflin in the first round (33rd overall) of the 2012 MLB draft, and he spent three seasons in the Padres' farm system. In December 2014, Eflin was traded twice in the course of 24 hours, first to the Los Angeles Dodgers as part of a package for all-star outfielder Matt Kemp, and then to the Phillies as part of a package for franchise star Jimmy Rollins. Eflin made his MLB debut with the Phillies in and bounced between the major league and minor league levels for several seasons. Beginning in 2019, he landed in the major leagues and became an anchor of the Phillies' starting rotation in 2019–21 seasons, but a right knee contusion resulted in a stint on the 60-day injured list, and Eflin was moved to the bullpen after his return in September 2022. He signed with the Rays as a free agent after the 2022 season.
Eflin relies heavily on a sinking fastball that he pairs with a slider and curveball. Although he has experimented with being a power pitcher, he relies more on his command and pitching to contact. He is a Christian and credits his faith as having helped him through a challenging upbringing that included several family tragedies.
Eflin attended Paul J. Hagerty High School in Oviedo, Florida, where he played baseball. His junior year of high school, Eflin planned to quit the baseball team to join the golf team, but he ultimately abandoned that plan. While he was in high school, he grew seven inches and became a dominant starting pitcher who attracted attention from colleges and professional scouts. In his senior year, he had an 0.51 earned run average (ERA) and 59 in 43 innings pitched. Although Eflin signed a National Letter of Intent to attend UCF on a college baseball scholarship, he ultimately signed with the San Diego Padres after being drafted.
The next year, in his first full professional season, he pitched for the Fort Wayne TinCaps of the Single–A Midwest League. Eflin posted a 7–6 record and a league-leading 2.73 ERA. He recorded 86 strikeouts in innings. After the season, baseball analyst Keith Law ranked Eflin the eighth-best prospect in the Padres' minor league system, noting he was at a more advanced stage of development as a pitcher than two of the higher-ranked pitching prospects but might have a slightly lower ceiling. In 2014, Eflin pitched for the Lake Elsinore Storm of the Class A-Advanced California League, and he finished the season with a 10–7 win–loss record and a 3.80 ERA, with 93 strikeouts in 128 innings. After the season, he was ranked the number five prospect in the Padres' system, recognized by scouts for his "stellar control" who avoided issuing walks to opposing hitters.
After Baseball America named him the fourth-best prospect in the Phillies minor league system prior to the 2015 season, the Phillies invited Eflin to spring training as a non-roster player before assigning him to the Class AA Reading Fightin Phils. Eflin spent the 2015 season in the Eastern League as part of a starting rotation that included top Phillies prospects Aaron Nola, Jesse Biddle, Ben Lively, and Windle, the anticipated cornerstones of a new Phillies pitching staff. He finished the 2015 season with an 8–6 record with a 3.69 ERA and a 1.21 walks plus hits per inning pitched (tied for ninth in the league), with 68 strikeouts in innings pitched. He was the April 12 Eastern League Pitcher of the Week, and a mid-season Eastern League All Star. After the season, he pitched for Team USA in the 2015 Pan American Games, which won the silver medal. 2015 marked the first time Eflin would work with catcher Andrew Knapp, with whom he developed a strong rapport that lasted once both reached the major leagues; although Knapp has been the Phillies' backup catcher, he often plays when Eflin pitches, and Eflin has recorded better statistics with Knapp behind the plate than other Phillies' catchers. Eflin has said of Knapp, "Sometimes, I feel like he knows me better than myself ... A great thing about Knappy is he cares a lot more about the pitch calling and defensive catching than he does hitting. I'm not saying he doesn't care about hitting, but his main goal is to be a catcher that pitchers trust."
Eflin received another invitation to spring training in 2016. Eflin began the 2016 season with the Lehigh Valley IronPigs of the Class AAA International League, and was named the league's Pitcher of the Week on April 18. With Lehigh Valley, he was 5–2 with a 2.90 ERA and 55 strikeouts in innings. Eflin made his MLB debut on June 14, 2016, at 22 years of age (making him the fourth-youngest pitcher to debut for the Phillies since 2000), allowing eight earned runs by the Toronto Blue Jays in innings on nine hits, three of which were . Eflin's game score of five was the sixth-worst debut in major league history, and worst in Phillies franchise history. Eflin rebounded with two in the month of July, including a Maddux shutout of the Atlanta Braves. The Phillies placed Eflin on the disabled list on August 9 due to patellar tendinopathy in both knees, and he underwent a pair of season-ending knee surgeries in August and September, respectively. In 2016 with the Phillies, he was 3–5 with a 5.54 ERA, and 31 strikeouts in innings.
Eflin began the 2017 season on the 10-day disabled list in an effort to continue recovery from both knees. He was activated on April 11 and optioned to Triple-A. He was the April 17, 2017, International League Pitcher of the Week. On April 18, he was recalled by the Phillies to replace an injured Clay Buchholz in the rotation. His season debut was the same night against the New York Mets, and he began a 29-inning streak of not allowing any runs to opposing hitters that spanned four starts. At the end of May, he returned to the minor leagues, and in June, he missed time due to an injured elbow. In 2017 with the Phillies, he was 1–5 with a 6.16 ERA, and 35 strikeouts in innings, following a strong start to the season by struggling to its finish. That season—his time split between Lehigh Valley, the Class A-Advanced Clearwater Threshers, and the GCL Phillies—he combined to go 2–4 with a 3.74 ERA and 50 strikeouts in minor league innings.
Entering the 2021 season, analysts, coaches, and teammates suggested Eflin could be a candidate for a breakout season near the top of the Phillies' starting rotation. New Phillies pitching coach Caleb Cotham said in his opening press conferences that the Phillies' starting rotation has three potential candidates for the Cy Young Award, which the media has interpreted to mean Nola, Zack Wheeler, and Eflin. Eflin worked to a 4–7 record and 4.17 ERA with 99 strikeouts in 18 starts for the Phillies in 2021. On September 8, 2021, it was announced that Eflin would undergo season-ending knee surgery to repair a tear in his right patellar tendon.
In the 2022 regular season he was 3–5 with one save and a 4.04 ERA over 75.2 innings in 20 games (13 starts). But later Eflin suffered a right knee contusion and he was placed on the 60-day injured list. After he was reactivated in September, Eflin was moved to bullpen, and he had a 3.38 ERA over 10 2/3 playoff innings in 10 games, and earned a save in Phillies' series-clinching win over Cardinals in Game 2 of the NL Wild Card Series.
On November 7, 2022, two days after Phillies lost the 2022 World Series, Eflin declined his end of the mutual option for 2023 season, and became a free agent for the first time in his career, receiving a $150,000 buyout.
Eflin began the 2024 campaign in the Rays' rotation, logging a 5–7 record and 4.09 ERA with 87 strikeouts across 19 starts.
Eflin was named the Opening Day starting pitcher for the Orioles on March 14, 2025. He made 14 starts for Baltimore during the 2025 campaign, compiling a 6–5 record and 5.93 ERA with 50 strikeouts across innings pitched. On August 12, 2025, manager Tony Mansolino announced that Eflin would miss the remainder of the season due to a lumbar discectomy procedure. Eflin was formally transferred to the 60-day injured list on August 17.
He has done work to support pediatric patients in Philadelphia hospitals, including appearances at sleepovers in the Phillies' clubhouse.
Career
San Diego Padres
Philadelphia Phillies
Prospect (2015–2017)
Major league starter (2018–2022)
Tampa Bay Rays (2023–2024)
Baltimore Orioles (2024–present)
Pitcher profile
Personal life
External links
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