Seeking to replace
Joe Garagiola Jr. as the Diamondbacks' general manager, the team chose
Josh Byrnes over Rizzo. This move coincided with the franchise's ownership transfer from
Major League Baseball to a
Washington, D.C.-based investment group headed by
Ted Lerner. Three days after Bowden's sudden resignation on March 1, 2009, Rizzo was promoted to general manager on an interim basis by team president
Stan Kasten. He was named the full-time senior vice president and general manager on August 20, 2009. On October 19, 2010, Rizzo signed a five-year contract extension and was promoted to executive vice president of baseball operations and general manager. The last two years of this contract were club options. On June 24, 2021, at Miami, the Nationals beat the Marlins, 7–3, marking Rizzo's 1,000th win as general manager since taking over the club during 2009 Spring Training. In doing so, he became the ninth active president of baseball operations and general manager to reach the 1,000 win mark and the sixth active to do it with one team. during the celebration for the 2019 World Series Champions in Nov 2019. The Nationals have had success under Rizzo, winning a World Series in 2019 and four National League East titles (2012, 2014, 2016, 2017) during his tenure. In April 2022, Rizzo was inducted into the Triton College Alumni Wall of Fame. In December 2021, he was named the Italian American Baseball Foundation Executive of the Year. After winning the World Series in 2019, he was named Executive of the Year by Baseball America and the Boston Chapter of the BBWAA. The Boston Chapter of the
BBWAA also honored him with the same award following the 2012 season. He also garnered Executive of the Year honors in 2012 from the Pitch and Hit Club of Chicago, which followed 2011 Man of the Year honors from the Lido Civic Club of Washington, D.C. In November of 2009, Rizzo convinced
Davey Johnson to sign on as senior advisor and help revamp the Nationals' on-field operations. In June of 2011, Rizzo appointed him field manager and Johnson led the team to its first playoff appearance and through the 2013 season. On December 5, 2010, Rizzo signed right fielder
Jayson Werth to a seven-year contract that immediately changed the perception of the Nationals. One year later, Rizzo signed franchise cornerstone
Ryan Zimmerman, to a six-year contract extension. From 2009 to 2012 Rizzo's Nationals won at least 10 more games than the season prior: 59 wins in 2009, 69 in 2010, 80 in 2011, 98 in 2012. The last team to do this was the
Boston Red Sox from 1906 to 1909, making the Nationals the first team in over 100 years to complete such a feat without the benefit of an artificially deflated win total associated with a work stoppage. Rizzo
shut down ace pitcher Stephen Strasburg late in the 2012 season as he recovered from
Tommy John surgery from the year before. The Nationals promoted Rizzo to president of baseball operations during the 2013 season. To strengthen the rotation before the 2015 season, Rizzo signed ace pitcher
Max Scherzer to a seven-year contract, introducing him on January 21, 2015. In December 2015, Rizzo pulled off a three-team trade that netted shortstop
Trea Turner and right-handed pitcher
Joe Ross from the San Diego Padres and sent outfielder
Steven Souza Jr. to the
Tampa Bay Rays. With the 2016 Baseball Winter Meetings taking place at nearby
National Harbor, Md., Rizzo acquired outfielder
Adam Eaton from the White Sox in exchange for prospects
Lucas Giolito,
Reynaldo Lopez and
Dane Dunning. In 2016, the team picked up its option to extend Rizzo's contract through the 2018 season. With Washington ahead in the division by nearly 10 games following the 2017 All-Star break, Rizzo got a jump on the trade market on July 16, fortifying Washington's bullpen by acquiring relievers
Sean Doolittle and
Ryan Madson from the
Oakland Athletics. On July 28, he acquired veteran position player
Howie Kendrick from the
Philadelphia Phillies. Moments before the July 31 deadline, Rizzo further added to the bullpen with the acquisition of
Minnesota Twins reliever
Brandon Kintzler. On April 5, 2018, Rizzo signed a contract extension through the 2020 season. When Kendrick went down with an Achilles injury on May 19, 2018, Rizzo promoted 19-year-old outfield prospect Juan Soto to the Major Leagues. After 11 seasons as the head of Washington's baseball operations, Rizzo's team won the
2019 World Series, defeating the
Houston Astros in seven games. Rizzo's contract was then extended through 2023, giving him a raise above his $4 million per year salary. In a span of roughly 26 hours from July 29–30, 2021, Rizzo and the Washington Nationals acquired 12 players via six trades around the trade deadline. Those 12 players included
Josiah Gray,
Keibert Ruiz,
Riley Adams,
Mason Thompson, Gerardo Carrillo, and
Donovan Casey, among others. Other notable contributors Rizzo has brought in via trade during his tenure include
Nelson Cruz,
Josh Bell,
Gio Gonzalez,
Tanner Roark,
Blake Treinen,
Mark Melancon,
Wilson Ramos,
Denard Span,
Kurt Suzuki,
Michael Morse, and
Sean Burnett, among others. On July 2, 2022, the Nationals exercised Rizzo's option for the 2023 season. After a 37–53 start to the 2025 season, Rizzo was fired by the Nationals on July 6, 2025, after 19 seasons with the organization. The firing came alongside manager
Dave Martinez, who was also relieved of his duties after eight seasons with the team. Under Rizzo, the Nationals made five playoff appearances, won four division titles, one National League pennant, and one World Series title. However, at the time of Rizzo's firing, the Nationals had not achieved a winning season since their World Series run in 2019. ==Personal life==