That year, he had a .336 batting average and a .432 on-base percentage and recorded 57 stolen bases while only being caught stealing four times.

[11] He made his professional debut three days later with the Eugene Emeralds of the Class A-Short Season Northwest League.

[20] After playing ten games for Harrisburg, the Nationals promoted Turner to the Syracuse Chiefs of the Class AAA International League.

[25] Turner went nine at-bats before collecting his first MLB hit on September 3, beating out a ground ball to reach first base safely.

In spring training in 2016, Turner competed with Danny Espinosa and Stephen Drew to be the Nationals starting shortstop.

[29] He was optioned back to Syracuse at the end of the series, as first baseman Ryan Zimmerman was reactivated from paternity leave.

[30] With Michael A. Taylor and Ben Revere turning in lackluster offensive performances as the Nationals' primary center fielders and Espinosa performing well as the team's everyday shortstop, Turner began getting starts in center field with the Nationals midway through the season.

[33] He finished second in NL Rookie of the Year Award balloting to Corey Seager despite playing in only 73 of the 162 games that season.

[38] Turner stole four bases against the New York Mets in a June 18 game to set a personal best and tie Marquis Grissom (in 1992 for the Montreal Expos against the San Francisco Giants) for the franchise record.

[40] Two days later, Turner was hit on the right wrist by a fastball from Cubs reliever Pedro Strop and suffered a non-displaced fracture, sending him to the 10-day disabled list for the second time in the season.

[41] Turner told The Washington Post's Thomas Boswell it was the first time since he was 12 that he had broken a bone, though he claimed the injury "didn't feel that bad" after Strop's pitch hit him, and he remained in the game for an inning and a half before being lifted for a defensive substitute.

[42] The Nationals purchased the contract of infielder Adrián Sánchez from the Class-AAA Syracuse Chiefs to take Turner's place on the roster.

[43] Turner was activated from the disabled list on August 28 and made his return to the lineup the following night against the Miami Marlins.

On July 5, Turner had eight RBIs and hit his first career grand slam during a franchise-record 9-run comeback against the Miami Marlins.

[52] In the NL Wild Card Game, Turner hit his first career postseason home run off of Brandon Woodruff of the Milwaukee Brewers.

The Nationals defeated the Brewers and went on to win the World Series over the Houston Astros, earning the first championship in franchise history.

[54] On July 30, 2021, Turner was traded to the Los Angeles Dodgers along with Max Scherzer in exchange for Josiah Gray, Keibert Ruiz, Gerardo Carrillo, and Donovan Casey.

[55] Starting as a shortstop for the team, Turner moved to second base when Corey Seager returned from the injured list.

[58] On March 22, Turner signed a one-year, $21 million, contract with the Dodgers to avoid salary arbitration, and he returned to playing shortstop after Seager departed as a free agent.

[64] On August 19, 2023, in a 12–3 win against the Washington Nationals, Turner became the third player in Phillies history to hit two home runs in the same inning.

[77][78] Harabedian had also competed in high school gymnastics,[79] and, on January 18, 2010, was featured by Faces in the Crowd in Sports Illustrated.

[80] Turner and Harabedian married in November 2018 at St. Joseph's Catholic Church in Washington, D.C.[81] In February 2021, the couple announced the birth of their first child, a son.

[84] During the 2018 season, Twitter posts Turner made during college using derogatory language, particularly anti-gay and mentally disabled slurs, became public.

[85] Turner became the third player to have offensive tweets from his past discovered in the month of July 2018, following Josh Hader and Sean Newcomb.

[86] Turner apologized for the social media postings and stated that his being a teenager at the time was no excuse at a tearful press conference called before the Nationals' next game.