Daniel Vallejo
Adolfo Daniel Vallejo is a Paraguayan professional tennis player. He has a career-high ATP singles ranking of No. 143 achieved on 24 November 2025 and a doubles ranking of No. 435 reached on 21 April 2025. He is currently the No. 1 singles player from Paraguay.
Vallejo represents Paraguay at the Davis Cup, where he has a win–loss record of 5–3.
Junior career
Vallejo had remarkable results on the ITF junior circuit, maintaining a 107–38 singles win-loss record. In 2021, he won the prestigious Orange Bowl in Plantation, United States, defeating American Bruno Kuzuhara in the final. He was the first Paraguayan player to win that event and only the second to reach the final after Víctor Pecci.In January 2022, he was a runner-up in the boys' doubles category at the 2022 Australian Open, with American Alex Michelsen. The pair lost to second seeds Bruno Kuzuhara and Coleman Wong in the final.
He reached an ITF junior combined ranking of world No. 1 on 15 August 2022.
Professional career
2023: Maiden ATP Challenger doubles title
In July 2023, Vallejo 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.2024-2025: Challenger title and top 150 in singles
In March 2024, Vallejo 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.In March 2025 ranked at a career-high of No. 187, achieved on 17 March 2025, Vallejo reached the semifinals at the home Challenger in Asunción, Paraguay but lost to eventual champion Emilio Nava. Following winning the 2025 Guayaquil Challenger, Vallejo reached the top 150 in the singles rankings at world No. 143 on 24 November 2025.
Performance timeline
Singles
ATP Challenger Tour finals
Singles: 9 (5 titles, 4 runner-ups)
| Result | W–L | Date | Tournament | Tier | Surface | Opponent | Score | ||||||||||||||||||||||||||||||||||||||||||||||
| Loss | 0–1 | 2023 Challenger Santa Fe – Singles| | Challenger Santa Fe, Argentina | Challenger | Clay |  dts|Mar 2024Doubles: 1 (title)
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dts|Jul 2023