History of Pete Alonso in Timeline

Pete "Polar Bear" Alonso is an American professional baseball first baseman currently playing for the Baltimore Orioles in MLB. He previously played for the New York Mets and has also represented the United States in international competition.

Sections (3)

Full Timeline Career & Achievements Success & Recognition

1900: MLB Extra-Base Hits Record

Since 1900, Pete Alonso became the first player in MLB history to record 11 extra-base hits in his first 10 career games.

1938: Johnny Rizzo set franchise record

On August 27, 2019, Pete Alonso became the first rookie to set his franchise's single-season home run record since Johnny Rizzo did it for the Pittsburgh Pirates in 1938.

1942: Military service in World War II

From 1942 to 1945, Pete Alonso's grandfather, Peter Conrad Alonso, served in World War II. This interrupted his education at Jamaica High School.

1945: End of Military Service

In 1945, Peter Conrad Alonso ended his military service in World War II.

1951: Marriage to Anna Pirraglia

In 1951, Pete Alonso's grandfather, Peter Conrad Alonso, married Anna Pirraglia after meeting her at New York University.

1963: Family moved to Lancaster, Ohio

In 1963, Pete Alonso's paternal family moved to Lancaster, Ohio.

1975: Félix Millán Played All Games

In 2024, Pete Alonso became the second player in Mets history to appear in every game in a single-season since Félix Millán in 1975.

1976: Dave Kingman Home Runs Before May 1

In 1976, Dave Kingman hit the most home runs by a Mets player before May 1, tying a record with nine, which Pete Alonso also achieved.

1983: Alonso breaks Mets rookie home run record

In 2019, Pete Alonso hit his 27th home run, breaking the Mets rookie home run record that was previously set by Darryl Strawberry in 1983.

December 7, 1994: Pete Alonso Born

On December 7, 1994, Peter Morgan Alonso, also known as "Polar Bear," was born. He is an American professional baseball first baseman.

Others born on this day/year

1999: Mike Piazza's RBI Record

In 2022, Pete Alonso drove in 5 runs against the Oakland Athletics setting a new Mets' single-season RBI record with 125, breaking the record previously held by Mike Piazza in 1999.

2006: Carlos Delgado Home Runs Before May 1

In 2006, Carlos Delgado hit the most home runs by a Mets player before May 1, tying a record with nine, which Pete Alonso also achieved.

2008: David Wright's RBI Record

In 2022, Pete Alonso drove in 5 runs against the Oakland Athletics setting a new Mets' single-season RBI record with 125, breaking the record previously held by David Wright in 2008.

2013: John Buck Home Runs Before May 1

In 2013, John Buck hit the most home runs by a Mets player before May 1, tying a record with nine, which Pete Alonso also achieved.

2014: Played for the Madison Mallards

In 2014, Pete Alonso played collegiate summer baseball with the Madison Mallards of the Northwoods League.

2015: Met Haley Walsh

In 2015, Pete Alonso met Haley Walsh while playing in the Cape Cod collegiate summer league, beginning their relationship.

2015: Played for the Bourne Braves

In the summer of 2015, Pete Alonso played for the Bourne Braves of the Cape Cod Baseball League.

2016: Neil Walker Home Runs Before May 1

In 2016, Neil Walker hit the most home runs by a Mets player before May 1, tying a record with nine, which Pete Alonso also achieved.

2016: Drafted by the Mets

In 2016, Pete Alonso was selected by the New York Mets in the MLB draft after playing college baseball for the Florida Gators.

2016: Professional Debut with Brooklyn Cyclones

In 2016, after being drafted by the New York Mets, Pete Alonso made his professional debut with the Brooklyn Cyclones, where he posted a .322 batting average with 5 home runs and 21 RBIs in 30 games.

2016: Junior Year at University of Florida

In 2016, during his junior year at the University of Florida, Pete Alonso achieved a .374/.469/.659 batting average with 14 home runs and 60 RBIs in 58 games.

2017: Promotion to Binghamton Rumble Ponies

In 2017, Pete Alonso started the season with the St. Lucie Mets and was later promoted to the Binghamton Rumble Ponies in August.

2018: All-Star Futures Game

In 2018, Pete Alonso represented the Mets in the All-Star Futures Game. That season, he played for Binghamton and Las Vegas, with 36 home runs and 119 RBIs. He also won the Joe Bauman Home Run Award.

2019: First Home Run Derby Win

In 2019 Pete Alonso won his first Home Run Derby and he also won the 2021 Home Run Derby.

2019: Breaks Rookie Home Run Record, Wins Rookie of the Year

In 2019, Pete Alonso broke the MLB rookie home run record with his 53rd home run and was awarded the National League Rookie of the Year. He also led all of MLB in home runs.

2019: MLB Debut and Rookie of the Year Award

In 2019, Pete Alonso made his MLB debut on Opening Day and went on to win the National League Rookie of the Year Award. He also set a major league record for rookies with 53 home runs that year.

2019: MLB Debut and First Home Run

In 2019, Pete Alonso made the Mets Opening Day roster as the starting first baseman. On April 1, 2019, he hit his first major league home run against the Miami Marlins.

2019: All-Star Selection and Rookie of the Month

In 2019, Pete Alonso was selected as a reserve to the MLB All-Star Game and won the NL Rookie of the Month Award for June.

2019: Polar Bear Nickname

In 2019, during spring training, Pete Alonso received the nickname "Polar Bear" from Mets third baseman Todd Frazier.

September 3, 2020: First Career Walk-Off Home Run

On September 3, 2020, Pete Alonso hit his first career walk-off home run in a game against the New York Yankees.

2020: The Alonso Foundation formed

In 2020, Pete Alonso and his wife Haley formed The Alonso Foundation, a charitable organization.

November 12, 2021: Marriage to Haley Walsh

On November 12, 2021, Pete Alonso married Haley Walsh at Sacred Heart Catholic Church in Tampa.

2021: Talent Evaluators Favor Dominic Smith

Heading into the 2021 season, some talent evaluators favored Dominic Smith as the team's starting first baseman due to Alonso's sophomore slump.

2021: Home Run Derby Win

In 2021, Pete Alonso won the MLB Home Run Derby for the second time.

2021: Second Consecutive Home Run Derby Win

On July 12, 2021, Pete Alonso won his second consecutive Home Run Derby, becoming the third player to ever win back-to-back Derbies. He defeated Trey Mancini in the final round.

2021: 100th Career Home Run

On September 7, 2021, Pete Alonso hit his 100th career home run against the Miami Marlins. He achieved the feat in 347 games.

March 13, 2022: Car Accident

On March 13, 2022, Pete Alonso was involved in a car accident in Tampa, Florida, where his vehicle flipped over after being struck by another driver.

March 22, 2022: Signed One-Year Contract with Mets

On March 22, 2022, Pete Alonso signed a one-year, $7.4 million contract with the Mets, avoiding salary arbitration.

August 17, 2022: Joins United States national baseball team

On August 17, 2022, Pete Alonso announced he would join the United States national baseball team in the 2023 World Baseball Classic.

2022: Led League in Runs Batted In

In 2022, Pete Alonso led the league in runs batted in (RBI).

2022: Franchise Record for RBI

In 2022, Pete Alonso played in 160 games for the Mets, batting .271 with 40 home runs and 131 RBIs, breaking the franchise record and tying Aaron Judge for the most RBI in the major leagues.

2022: Named to MLB All-Star Game

In 2022, Pete Alonso was named to the MLB All-Star Game for the second time in his career and participated in the Home Run Derby.

January 13, 2023: Agreed to Contract with Mets

On January 13, 2023, Pete Alonso and the Mets agreed to a one-year, $14.5 million contract during the arbitration period.

2023: World Baseball Classic

In 2023, Pete Alonso played in the World Baseball Classic, getting two hits in fourteen at-bats across five games for the United States national baseball team.

2023: All-Star Game Selection

On July 2, 2023, Pete Alonso was named to the MLB All-Star Game for the third selection of his career. He and Keith Hernandez are the only two Mets first basemen to be named to three All-Star teams.

2023: Tied Howard Johnson for 4th in Mets Home Run List

On September 27, 2023, Pete Alonso hit his 46th home run of the season, tying Howard Johnson for 4th place on the Mets all-time home run list with his 192nd career homer.

January 11, 2024: Agreed to Contract with Mets

On January 11, 2024, the Mets and Pete Alonso agreed to a one-year, $20.5 million contract to avoid salary arbitration.

2024: Played All 162 Games

In 2024, Pete Alonso played in all 162 games for the Mets, making him the second player in Mets history to appear in every game in a single season.

2024: Inducted into Madison Mallards Hall of Fame

In 2024, Pete Alonso was inducted into the Hall of Fame for the Madison Mallards of the Northwoods League.

2024: Named to MLB All-Star Game

On July 7, 2024, Pete Alonso was named to the MLB All-Star Game for the fourth selection of his career, passing Keith Hernandez for the most appearances by a Mets first baseman.

2024: Go-Ahead Home Run in Wild Card Series

On October 3, 2024, in Game 3 of the National League Wild Card Series, Pete Alonso hit a go-ahead, three-run home run in the top of the 9th inning against the Milwaukee Brewers, leading the Mets to a 4-2 victory and eliminating the Brewers from the playoffs.

April 2025: Pregnancy Announcement

In April 2025, Pete Alonso and his wife Haley announced they were expecting their first child.

October 2025: Birth of Son

In October 2025, Pete Alonso and his wife Haley gave birth to their son.

November 3, 2025: Opted out of contract and became a free agent

On November 3, 2025, Pete Alonso opted out of his 2026 contract with the Mets and became a free agent.

December 11, 2025: Signed with the Baltimore Orioles

On December 11, 2025, Pete Alonso signed a five-year, $155 million contract with the Baltimore Orioles.

December 2025: Changed number to #25

After joining the Orioles in December 2025, Pete Alonso announced he was changing his number from #20 to #25 because they gave birth to their son in 2025.

2025: Silver Slugger Award and Opt-Out

In 2025, Pete Alonso played all 162 games for the Mets and won his first Silver Slugger award. On September 28, 2025, he announced he would opt out of his contract and elect free agency.