Adolfo Daniel Vallejo (born 28 April 2004) is a Paraguayan professional tennis player. He has a career-high ATP singles ranking of No. 104 achieved on 2 February 2026 and a doubles ranking of No. 435 reached on 21 April 2025. He is currently the No. 1 singles player from Paraguay.[2]
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.[citation needed] 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.
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.[4][5] 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.[6] Following winning the 2025 Guayaquil Challenger, Vallejo reached the top 150 in the singles rankings at world No. 143 on 24 November 2025.[7]
Performance timeline
Key
W
F
SF
QF
#R
RR
Q#
DNQ
A
NH
(W) winner; (F) finalist; (SF) semifinalist; (QF) quarterfinalist; (#R) rounds 4, 3, 2, 1; (RR) round-robin stage; (Q#) qualification round; (DNQ) did not qualify; (A) absent; (NH) not held; (SR) strike rate (events won / competed); (W–L) win–loss record.
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Paraguay 
