Pete Alonso Bio
Peter Morgan Alonso, widely known by his nickname “Polar Bear,” is an American professional baseball first baseman who currently plays for the Baltimore Orioles in Major League Baseball (MLB). Born on December 7, 1994, in Tampa, Florida, Alonso first rose to prominence as a power-hitting rookie with the New York Mets in 2019, when he set a major league rookie record with 53 home runs and won the National League Rookie of the Year Award. Across his MLB career, he has been selected to five All-Star Games, led the league in home runs and runs batted in (RBI), and established himself as the New York Mets’ all-time franchise leader in home runs. In December 2025, he signed a five-year, $155 million contract with the Baltimore Orioles, beginning a new chapter in his career.
Early Life and Background
Peter Morgan Alonso was born on December 7, 1994, in Tampa, Florida. He attended Jesuit High School in Tampa for his first two years before transferring to Henry B. Plant High School to complete his secondary education. During his freshman year, Alonso played both lacrosse and football before choosing to focus entirely on baseball, where he initially played third base.
Alonso’s family history reflects a blend of immigrant heritage and athletic tradition. His paternal grandfather, Peter Conrad Alonso, was a Spanish refugee who fled Barcelona during the Spanish Civil War and settled in Queens, New York, after arriving through Ellis Island. His grandfather later met and married Anna Pirraglia, of Italian descent, and the family eventually moved to Lancaster, Ohio. Alonso’s father, Peter Matthew Alonso, met his mother, Michelle Lynn Alonso, an Ohio native who played college softball at Ohio Wesleyan University.
Path to Baseball
After high school, Alonso enrolled at the University of Florida, where he played college baseball for the Florida Gators as a first baseman and earned All-Southeastern Conference honors during his freshman year. He gained additional experience in collegiate summer leagues, playing for the Madison Mallards of the Northwoods League in 2014 and the Bourne Braves of the Cape Cod Baseball League in 2015. He was inducted into the Madison Mallards Hall of Fame in 2024.
During his junior season at Florida in 2016, Alonso posted an impressive .374/.469/.659 slash line with 14 home runs and 60 RBIs in 58 games. He also competed for the Gators in both the 2015 and 2016 College World Series. Following this strong college campaign, the New York Mets selected him in the second round of the 2016 MLB Draft with the 64th overall pick, signing him to a $909,200 bonus.
Pete Alonso Career
Early Career (2016–2018)
Alonso began his professional career in 2016 with the Brooklyn Cyclones of the Class A Short Season New York–Penn League, where he batted .322 with five home runs and 21 RBIs in 30 games and was selected for the league’s All-Star Game. He opened 2017 with the St. Lucie Mets of the Class A-Advanced Florida State League, hitting .286 with 16 home runs and 58 RBIs in 82 games before earning a midseason promotion to the Binghamton Rumble Ponies of the Class AA Eastern League.
Entering 2018, MLB.com ranked Alonso as New York’s fourth-best prospect. He started the year in Binghamton and was promoted to the Las Vegas 51s of the Class AAA Pacific Coast League, representing the Mets in the 2018 All-Star Futures Game. Across 132 games that season, Alonso slashed .285/.395/.579 with 36 home runs and 119 RBIs, earning the Joe Bauman Home Run Award. He also hit the final home run ever recorded at Cashman Field, delivering a walk-off homer in the last game played there.
New York Mets Era (2019–2025)
Alonso made his MLB debut on Opening Day in 2019 as the Mets’ starting first baseman and recorded his first hit on March 28 against the Washington Nationals. He hit his first major league home run on April 1 off Miami Marlins pitcher Drew Steckenrider. By the end of April, he was named NL Rookie of the Month, and he continued his historic pace by becoming the first player since 1900 with 11 extra-base hits in his first 10 career games.
In June 2019, Alonso broke the National League record for home runs by a rookie before the All-Star break, surpassing Cody Bellinger, and then set a new Mets rookie home run record previously held by Darryl Strawberry. He was selected to the 2019 MLB All-Star Game and won the 2019 Home Run Derby, defeating Vladimir Guerrero Jr. 23–22 in the final round. On September 27, he hit his 52nd homer to tie Aaron Judge’s rookie record, then broke it the next day with his 53rd off the Atlanta Braves’ Mike Foltynewicz. He finished the year batting .260/.358/.583 with 120 RBIs, winning the NL Rookie of the Year Award with 29 of 30 first-place votes.
Alonso continued producing at a high level in subsequent seasons. In 2021, he won his second consecutive Home Run Derby and reached his 100th career home run in just 347 games, the second-fastest pace in MLB history behind Ryan Howard. In 2022, he set a new Mets single-season RBI record with 131, led the National League in RBIs, and was named to his second All-Star team. In 2023, he hit 46 home runs and was again selected to the All-Star Game. In 2024, he played all 162 games, became the fourth-fastest player in MLB history to reach 200 career home runs, and delivered one of the most dramatic moments in Mets postseason history with a go-ahead three-run homer in the ninth inning of the NL Wild Card Series against the Milwaukee Brewers.
After his initial contract expired, Alonso reached a two-year, $54 million agreement with the Mets in February 2025 that included an opt-out clause. He had a strong 2025 campaign, slashing .272/.347/.524 with 38 home runs, 126 RBIs, and a career-high 41 doubles that led the National League. He was named an All-Star for the fifth time and won his first Silver Slugger Award. On August 12, 2025, he hit his 253rd and 254th career home runs to surpass Darryl Strawberry as the Mets’ all-time franchise home run leader. After the season, Alonso opted out of his contract and elected free agency.
Driving Style and Strengths
Alonso is known for his elite raw power, consistently ranking among MLB’s hardest hitters, and recorded the highest maximum exit velocity in the major leagues during the 2020 shortened season at 118.4 miles per hour. His strength lies in driving the ball to all fields, particularly in clutch situations, which has produced numerous late-inning and go-ahead home runs throughout his career. His patient plate approach and durability have allowed him to remain a steady middle-of-the-order presence.
Notable Events and Milestones
Beyond his historic rookie season, Alonso has authored several signature moments, including his back-to-back Home Run Derby titles in 2019 and 2021, his franchise-record-breaking home runs with the Mets, and his dramatic ninth-inning heroics in the 2024 NL Wild Card Series. His 53-homer rookie campaign remains a benchmark, and his standing as the Mets’ all-time home run leader cements his place among the franchise’s all-time greats.
Pete Alonso Career Wins
While Major League Baseball does not track wins in the traditional sense for position players, Alonso’s offensive achievements stand as his defining victories. He is a two-time Home Run Derby champion, a five-time All-Star, a Silver Slugger Award winner, and the owner of multiple franchise records. His rookie record of 53 home runs remains one of the most celebrated single-season accomplishments in modern baseball history.
MLB Highlights
Alonso’s MLB highlights begin with his record-shattering 2019 rookie season, in which he set the all-time rookie home run record and won the Home Run Derby. He went on to win a second consecutive Derby in 2021, claim the NL RBI title in 2022, and capture his first Silver Slugger Award in 2025. His most recent milestone came on August 12, 2025, when he broke Darryl Strawberry’s long-standing Mets career home run record.
Other Wins and Performances
In addition to his major league accomplishments, Alonso earned the Joe Bauman Home Run Award in the minor leagues in 2018 and was inducted into the Madison Mallards Hall of Fame in 2024. He represented the United States in the 2023 World Baseball Classic, where he recorded key hits against Venezuela and Cuba during the knockout rounds.
Pete Alonso Family
Family Background and Racing Lineage
Alonso’s family background reflects deep athletic and immigrant roots. His maternal grandfather, Peter Conrad Alonso, fled Barcelona during the Spanish Civil War and built a new life in New York before resettling in Ohio. His mother, Michelle Lynn Alonso, played college softball at Ohio Wesleyan University, helping establish the family’s athletic tradition. His father, Peter Matthew Alonso, carried on the family’s New York roots and connection to baseball as a Brooklyn Dodgers fan.
Personal Life
Alonso met his wife, Haley Walsh, in the summer of 2015 while playing in the Cape Cod Baseball League. The two maintained a long-distance relationship while Alonso attended the University of Florida and Walsh studied at Michigan State University. They became engaged in November 2018 and married on November 12, 2021, at Sacred Heart Catholic Church in downtown Tampa. In April 2025, the couple announced they were expecting their first child, and their son was born in October 2025. The couple also established The Alonso Foundation in 2020, a charitable organization supporting youth, veteran, and animal causes.
2025 Season Performance
Alonso’s 2025 season with the New York Mets was one of the most well-rounded of his career. He played in all 162 games and finished with a .272/.347/.524 slash line, 38 home runs, 126 RBIs, and a career-high 41 doubles that led the National League. His consistent production helped anchor the Mets’ lineup from the first day of spring training through the final out of the regular season.
He reached several major individual milestones in 2025, including passing David Wright for second place on the Mets’ all-time home run list in June and surpassing Darryl Strawberry as the franchise’s all-time home run leader in August. He was named to his fifth All-Star Game, hit a three-run homer in the Midsummer Classic, and earned his first career Silver Slugger Award.
Following the season, Alonso opted out of the second year of his contract and became a free agent for the second time in his career. On December 11, 2025, he signed a five-year, $155 million contract with the Baltimore Orioles, officially beginning the next chapter of his MLB journey.