WNBA Vandersloot was widely considered to be one of the top prospects in the
2011 WNBA draft. Her relatively small size had been a subject of concern, as was her defense—despite averaging 4.5 steals per game in the 2011 NCAA tournament and ending her Gonzaga career with 366. However, she was seen as likely to be one of the top seven picks, and was ultimately picked third overall by the Chicago Sky. Her average of 3.7 assists per game (apg) was 11th in the league She was also named as an
Eastern Conference reserve for the
2011 WNBA All-Star Game, However, despite these efforts, the Sky finished 12–22, missing out on the playoffs for the first time in four years. In the
2018 season, Vandersloot broke the single-season record for assists and finished off the season with 258 assists and her own assists per game record with 8.6 apg. On July 20, 2018, Vandersloot became the seventh player in league history to post a triple-double, she scored 13 points along with 10 rebounds and a career-high 15 assists in a 114–99 victory over the
Dallas Wings. She also averaged a career-high in scoring. Despite these performances, the Sky missed out on the playoffs yet again, they finished 13–21. In the
2019 season, Vandersloot continued to exceed assists records. She broke her own league record with 9.1 assists per game. She was selected to the
2019 WNBA All-Star Game, making it her second All-Star appearance. Her season performance would help the Sky return to the playoffs with a 20–14 record, earning the number 5 seed. In the first-round elimination game, the Sky defeated the
Phoenix Mercury 105–76 to advance. In the second-round elimination game, the Sky were defeated by the
Las Vegas Aces 93–92 after a late game desperation half-court shot by
Dearica Hamby. In the
2020 season, the season was shortened to 22 games in a bubble at
IMG Academy due to the
COVID-19 pandemic. Vandersloot would average a career-high in scoring and once again set a new record for assists per game with 10, while playing and starting all 22 games. The Sky finished as the number 6 seed with a 12–10 record, but were eliminated by the
Connecticut Sun in the first round elimination game. In the
2021 season, Vandersloot started all 32 games for the Sky and once again led the league with 8.6 assists per game. The Sky finished the season as the sixth seed with a 16–16 record, but went on to a successful run in the playoffs, winning two single-elimination games and a semifinals series against the first-seeded
Connecticut Sun to reach the Finals for the first time since 2014. In the
2021 WNBA Finals, Vandersloot recorded 12.5 assists and 11.5 points per game, as the Sky defeated the Phoenix Mercury in four games to win their first championship. Across the 10 games in the 2021 postseason, she recorded 10.2 assists and 13 points per game. After the 2022 season, Vandersloot became a free agent and signed with the
New York Liberty in February 2023. The New York Liberty placed second in the WNBA to the Las Vegas Aces in 2023. In 2024, the Liberty won the WNBA Championship over the Minnesota Lynx. Courtney dedicated the season to her mother, Jan Vandersloot, who died in mid-summer 2024. In 2025, Vandersloot returned to the Sky. On June 8, 2025, it was announced that Vandersloot had sustained a right
anterior cruciate ligament (ACL) tear during the June 7 game against the Indiana Fever, would undergo surgery, and would miss the rest of the 2025 season.
European leagues In 2011, she signed with the
Turkish club
Beşiktaş. Because the WNBA season is held in the northern hemisphere summer, the traditional offseason for basketball throughout the world, many of the league's players participate in overseas leagues during the traditional season and return to their WNBA teams in the summer. In February 2022, after the
2022 Russian invasion of Ukraine, she left
UMMC Ekaterinburg in the
Russian Women's Basketball Premier League. In April 2022, she joined Hungarian club
Sopron Basket for the 2022–23 European season. In January 2023, she signed with
Fenerbahçe and left at end of the season.
Unrivaled On September 16, 2024, it was announced that Vandersloot would appear and play in the inaugural season of
Unrivaled, a new women's 3-on-3 basketball league founded by
Napheesa Collier and
Breanna Stewart. ==Personal life==