Born and raised inAshburn, Virginia to Leslie and Alex Fox, she has a brother and sister, Garrett and Lauren.[2][3] She began playing soccer at the age of five.[2] She also ran5Ks and practiced gymnastics until middle school.[2][4] She attendedStone Bridge High School. As a freshman Fox led the team with 16 goals, reaching the state championship game, and was named first-team all-state. She graduated one year early and entered theUniversity of North Carolina in January 2017.[2]
Fox started the first thirteen games of her freshman fall season with theNorth Carolina before suffering atorn ACL and missing the rest of the season. She was named to the All-Atlantic Coast Conference third team and all-freshman team.[2] In her sophomore season, due to her call-up to the USWNT in November 2018, she missed theACC tournament semifinals and final and the first round ofNCAA tournament. She returned in the third round as North Carolina made it all the way to the national final, where they fell 1–0 toFlorida State.[5] Fox was named to the All-ACC first team and the all-tournament team of the NCAA championship.[2]
Fox led the team with 11 assists in the 2019 season and was named first-team All-ACC andfirst-team All-American. She assisted on the winning goals toLotte Wubben-Moy andAlessia Russo in the semifinals and final respectively ofACC tournament, making the all-tournament team. She scored her first college goal in the first round of theNCAA tournament againstBelmont and found her second goal to tie the game againstUSC in the quarterfinals but then tore her ACL for a second time in that game. North Carolina went on to win the game and reached another national final but lost toStanford on penalties.[2][4] Fox was again named first-team All-ACC after the fall 2020 season.[6]
Fox was drafted byRacing Louisville FC as the first overall pick of the2021 NWSL Draft.[7] Fox played more minutes than any other NWSL rookie in 23 appearances for Racing. She led the league in interceptions, with 115, and was a finalist for theNWSL Rookie of the Year award.[8] Fox was named to theNWSL Second XI for her performances in her rookie season.[9] Ahead of the 2022 season, Fox was named as one of Racing's four team captains.[10] Racing Louisville would fail to make the playoffs during Fox's time with the squad. The club would finish the regular season in 9th place for both seasons.[11]
On January 11, 2024, Fox signed withArsenal.[16] Three days later, she made her debut for the club in Arsenal's FA Cup win to Watford (5–1).[17] On January 28, 2024, in her second league appearance, she recorded her first assist for Arsenal, setting upVivianne Miedema's goal and also helped set up the second goal in a 2–0 victory againstLiverpool.[m 1] She was named player of the match.[18]
Fox made herUEFA Women's Champions League debut with Arsenal on September 4, 2024, starting in a home match againstRangers which finished as a 6–0 victory.[19] She scored her first goal for the club during a 4–1 Champions League group stage win againstVålerenga on October 16, 2024.[20] At the beginning of December, Fox was named Arsenal’s player of the month for November.[21] Reflecting on her first year at Arsenal, Fox felt that she has been pushed and challenged since making the move.[22] On February 16, 2025, Fox scored her firstWSL goal for Arsenal againstTottenham in theNorth London Derby in the 90th minute.[m 2][23] Fox played all 90-minutes in the2025 UEFA Women's Champions League final on May 24, 2025, and defeated defending championsFC Barcelona 1–0 to secure Arenal's first European title since 2007. Fox along with Arsenal teammateJenna Nighswonger became the sixth and seventh Americans to win the UEFA Women's Champion League.[24]
On 16 September 2025, it was announced that Fox had been nominated for the CONCACAF Player of the Year award for 2024/25 season, as well as having been nominated for theBallon d'Or.[26][27]
In 2015, Fox was named to the roster for the2015 CONCACAF Women's U-20 Championship.[28] She scored a goal in the opening game of the tournament, a 2–2 draw vsMexico.[29] Fox appeared in every game of the tournament, as the U.S. captured their fifth CONCACAF Women's U-20 Championship.[30] Fox was named to the squad for the2016 FIFA U-20 Women's World Cup, she appeared in all six games for the U.S. as they finished fourth in the tournament.[31]
Fox did not participate in the2018 CONCACAF Women's U-20 Championship as she was still recovering from her ACL injury. She recovered in time to be named to the roster for the2018 FIFA U-20 Women's World Cup, one of three players to return for a second U-20 World Cup.[31] Fox appeared in one game as the U.S. failed to advance to the knockout stage.[32]
Fox received her first call-up to thesenior national team in November 2018 for a set of friendlies in Europe.[33] She earned her first cap on November 8, 2018, when she got the start at right back againstPortugal.[34] Fox was also in the starting lineup five days later againstScotland.
Fox was originally only named as a practice player for the USWNT training camp ahead of the2019 SheBelieves Cup, but afterDanielle Colaprico had to withdraw from the squad due to injury, Fox was added to the roster.[35]
On February 3, 2022, Fox was named to the2022 SheBelieves Cup roster for the tournament.[36] The tournament included the United States, Iceland, New Zealand, and Czech Republic as participating squads. Fox started in all three matches for the United States.[37][38][39] The U.S. would go on to win their 5th title after a draw in their first game.
Fox was named to the roster for the2023 SheBelieves Cup and was the only player to play three full ninety minute games, 270 minutes overall, as the USWNT won the tournament for the fourth consecutive year, and sixth time overall.[40] In the following national team camp for a set of friendlies againstIreland, Fox scored her first goal for the senior national team on April 8, 2023, which finished as a 2–0 victory.[41] On June 21, 2023, Fox was named to the USWNT roster for the2023 FIFA Women's World Cup in Australia and New Zealand.[42] Fox started in all four matches and played all but 8 minutes, and was part of a defense that allowed just two shots on goal and one goal all tournament before the USWNT were ultimately eliminated on penalties bySweden after a scoreless 0–0 draw in the Round of 16.[40]
On April 9, 2024, Fox converted her first professional penalty in a shootout againstCanada, to help win the2024 SheBelieves Cup for the USWNT.[43] After the match ended as a 2–2 draw, Fox converted the final penalty to finish the shootout at 5–4, and win the title for the seventh time.[44] Fox was selected to the 18-player roster for the2024 Summer Olympics in France and earned her fiftieth cap in a friendly againstMexico ahead of the Olympics on July 13, 2024.[45][46] She started in all six matches during the Olympic tournament, including the gold medal match againstBrazil, which the United States won 1–0 on a goal fromMallory Swanson.[47]
On February 11, 2025, Fox was named to the2025 SheBelieves Cup roster under manager Emma Hayes.[48] Fox would feature in all three matches for the United States againstColombia,Australia, andJapan.[49][50][51] The United States would lose to Japan to end their streak of SheBelieves Cup wins by finishing in 2nd place.[51]