section_path: Professional/2018–19: First titles, top 100
section_name: 2018–19: First titles, top 100
paragraph_text: 2018–19: First titles, top 100
  
  Gauff made her debut on the ITF Women's Circuit in May 2018 at the age of 14 as a qualifier in the $25k event at Osprey, where she won her first professional match. She received a wild card into qualifying at the US Open, but lost her opening match five months after turning 14 years old. In her first 2019 tournament, she finished runner-up in doubles at the $100k Midland Tennis Classic alongside Ann Li. Two weeks later, Gauff played her next event at the $25k level in Surprise and reached the finals in both singles and doubles. She finished runner-up in singles and won her first WTA Tour title in doubles alongside Paige Hourigan. In March, at the Miami Open, she recorded her first WTA Tour match win against Caty McNally.
  
  Gauff lost the second round of qualifying at the French Open. At Wimbledon, she defeated Aliona Bolsova and Greet Minnen. Gauff became the youngest player to reach the main draw at Wimbledon by qualifying in the Open Era at the age of 15 years and three months. In her main-draw debut, she upset five-time Wimbledon champion Venus Williams in straight sets. Gauff won over Magdaléna Rybáriková and No. 60 Polona Hercog, saving two match points against Hercog. The hype surrounding Gauff's first-round match win led to her third rounder moving to Centre Court. She was eliminated with a fourth-round loss to eventual champion Simona Halep. All four of Gauff's matches were most-watched matches on ESPN on their respective days during the first week of coverage. With this performance, she rose to world No. 141.
  
  Gauff played in one US Open Series tournament at the Washington Open, where she qualified for the main draw but lost in the first round. She entered the doubles event with McNally and defeated Fanny Stollár and Maria Sanchez in the final for their first career WTA title in their first joint WTA. At the US Open, Gauff wild-carded into the singles and doubles main draws. She continued her success in major singles with two three-set wins over Anastasia Potapova and Tímea Babos, both on Louis Armstrong. She was defeated in the third round by world No. 1 and defending champion Naomi Osaka. In doubles, Gauff and McNally won two matches, including an upset over ninth seeds Nicole Melichar and Květa Peschke. They lost in the third round to eventual runners-up Ashleigh Barty and Victoria Azarenka. Although Gauff lost in qualifying at the Linz Open, she entered the main draw as a lucky loser and won the title, notably upsetting top seed Kiki Bertens in the quarterfinals for her first top-10 victory. She defeated Jeļena Ostapenko in the final to become the youngest WTA player, at age 15, to win a singles title since 2004. With this title as well as a semifinal in doubles with McNally, Gauff made her top-100 debuts in both the WTA singles and doubles rankings. Gauff and McNally ended their year with a second WTA doubles title at the Luxembourg Open over Kaitlyn Christian and Alexa Guarachi.
  
  Gauff made her debut on the ITF Women's Circuit in May 2018 at the age of 14 as a qualifier in the $25k event at Osprey, where she won her first professional match. She received a wild card into qualifying at the US Open, but lost her opening match five months after turning 14 years old. In her first 2019 tournament, she finished runner-up in doubles at the $100k Midland Tennis Classic alongside Ann Li. Two weeks later, Gauff played her next event at the $25k level in Surprise and reached the finals in both singles and doubles. She finished runner-up in singles and won her first WTA Tour title in doubles alongside Paige Hourigan. In March, at the Miami Open, she recorded her first WTA Tour match win against Caty McNally.
  
  Gauff lost the second round of qualifying at the French Open. At Wimbledon, she defeated Aliona Bolsova and Greet Minnen. Gauff became the youngest player to reach the main draw at Wimbledon by qualifying in the Open Era at the age of 15 years and three months. In her main-draw debut, she upset five-time Wimbledon champion Venus Williams in straight sets. Gauff won over Magdaléna Rybáriková and No. 60 Polona Hercog, saving two match points against Hercog. The hype surrounding Gauff's first-round match win led to her third rounder moving to Centre Court. She was eliminated with a fourth-round loss to eventual champion Simona Halep. All four of Gauff's matches were most-watched matches on ESPN on their respective days during the first week of coverage. With this performance, she rose to world No. 141.
  
  Gauff played in one US Open Series tournament at the Washington Open, where she qualified for the main draw but lost in the first round. She entered the doubles event with McNally and defeated Fanny Stollár and Maria Sanchez in the final for their first career WTA title in their first joint WTA. At the US Open, Gauff wild-carded into the singles and doubles main draws. She continued her success in major singles with two three-set wins over Anastasia Potapova and Tímea Babos, both on Louis Armstrong. She was defeated in the third round by world No. 1 and defending champion Naomi Osaka. In doubles, Gauff and McNally won two matches, including an upset over ninth seeds Nicole Melichar and Květa Peschke. They lost in the third round to eventual runners-up Ashleigh Barty and Victoria Azarenka. Although Gauff lost in qualifying at the Linz Open, she entered the main draw as a lucky loser and won the title, notably upsetting top seed Kiki Bertens in the quarterfinals for her first top-10 victory. She defeated Jeļena Ostapenko in the final to become the youngest WTA player, at age 15, to win a singles title since 2004. With this title as well as a semifinal in doubles with McNally, Gauff made her top-100 debuts in both the WTA singles and doubles rankings. Gauff and McNally ended their year with a second WTA doubles title at the Luxembourg Open over Kaitlyn Christian and Alexa Guarachi.