section_path: Professional career/2019–2020: Pro debut
section_name: 2019–2020: Pro debut
paragraph_text: 2019–2020: Pro debut
  
  In April 2019, at the age of 15, Alcaraz made his Challenger debut at the JC Ferrero Challenger in Villena, after receiving a wild card. He won his first match against a 17-year old Jannik Sinner. With this victory, he became the first player born in 2003 to win a Challenger match. He was defeated in three sets by eighth seed Lukáš Rosol in the second round.
  
  Alcaraz went on to win four Challenger titles, three of them before the age of 18. He was the first player born in 2003 to reach a Challenger title match.
  
  In February 2020, at the age of 16, Alcaraz made his ATP main-draw debut at the Rio Open after receiving a wild card for the singles main draw. He defeated Albert Ramos Viñolas. Alcaraz was defeated in the second round by Federico Coria.
  
  In April 2019, at the age of 15, Alcaraz made his Challenger debut at the JC Ferrero Challenger in Villena, after receiving a wild card. He won his first match against a 17-year old Jannik Sinner. With this victory, he became the first player born in 2003 to win a Challenger match. He was defeated in three sets by eighth seed Lukáš Rosol in the second round.
  
  Alcaraz went on to win four Challenger titles, three of them before the age of 18. He was the first player born in 2003 to reach a Challenger title match.
  
  In February 2020, at the age of 16, Alcaraz made his ATP main-draw debut at the Rio Open after receiving a wild card for the singles main draw. He defeated Albert Ramos Viñolas. Alcaraz was defeated in the second round by Federico Coria.