Daniel Vallejo

Adolfo Daniel Vallejo (born 28 April 2004) is a Paraguayan tennis player. Vallejo has a career-high ATP singles ranking of world No. 299 achieved on 6 May 2024. He is currently the No. 1 Paraguayan tennis player.

On the ITF Junior Circuit, Vallejo had a career-high junior ranking of No. 1, achieved in August 2022.

Junior Career
In 2021, he won the Junior Orange Bowl in Plantation, Florida, defeating Bruno Kuzuhara in the final. He was the first Paraguayan player to win the tournament and only the second to reach the final after Víctor Pecci.

In 2022, he reached the final of the Australian Open in boys doubles, partnering with Alex Michelsen, losing in the final to Bruno Kuzuhara and Coleman Wong.

2023: First ATP Challenger doubles title
In July, he reached his first final on the Challenger Tour in Santa Fe, Argentina, losing to Mariano Navone in the final. The following month, he won his first Challenger doubles title in Lima, Peru, partnering with Gonzalo Bueno, defeating Jorge Panta and Ignacio Buse in the final.

2024: First ATP Challenger singles title, top 300
In March, he won his first Challenger title in São Léopoldo, Brazil, defeating Enzo Couacaud in the final. He became the youngest Paraguayan to win an ATP Challenger title and the fourth Paraguayan champion in ATP Challenger Tour history and first since Ramon Delgado in 2009. As a result, he reached the top 300 on 6 May 2024.

Davis Cup
Vallejo represents Paraguay at the Davis Cup, where he has a win–loss record of 5–3.