Sevilla FC fans are witnessing the emergence of a dynamic talent in Joaquín Martínez Gauna, widely known as Oso. The young Spaniard has quickly turn into a key figure for the Andalusian club, showcasing a versatility that has impressed coaches and supporters alike. Oso’s journey, from a promising forward to a modern full-back, highlights the club’s commitment to developing talent from within, and offers a glimpse into a potentially bright future for both the player and Sevilla.
Born in Torrevieja, Spain, on July 9, 2003, Oso’s path to professional football began with Algorfa CF, followed by stints at Kelme CF and Real Murcia CF before joining Málaga CF’s youth setup in 2018. He officially turned professional with Málaga’s reserves in 2021, making his debut in the Tercera División RFEF. It was there he began to demonstrate the attacking flair that would later become a hallmark of his game, scoring his first senior goal on April 9, 2022, in a 3-2 victory over UD San Pedro. [4]
From Striker to Versatile Defender
Oso’s transformation from a central striker – a position shared with his brother – to a left-back is a testament to the vision of Sevilla’s coaching staff. Initially signed for Sevilla’s B-team in July 2022, signing a three-year contract, [4] he was initially deployed in his familiar attacking role. Yet, under the guidance of Antonio Hidalgo, then manager of Sevilla Atlético, Oso was gradually shifted to the left side of the defense. Jesús Galván, who succeeded Hidalgo as manager of Sevilla Atlético, continued to utilize Oso as a full-back, recognizing his potential in the position.
“He makes a great season that year, the one of the promotion from second to first RFEF,” Galván said, reflecting on Oso’s early performances. “Last season, I told him it was his moment and that he had to take advantage of it. He was convinced, but he had a very tough injury, he broke the quadriceps of his left leg. He had a bad time, because he felt that his moment had passed.”
Galván emphasized Oso’s adaptability, noting his ability to play as an attacker, winger, or full-back. “He has goal-scoring ability because he has played as a forward all his life,” Galván explained. “You can get value from him, if he is really settled, I sense he has realized that it is his opportunity and that it is time to focus on his future. Sevilla will be able to produce money with him because he is a modern full-back of those that there are few.”
Breaking into the First Team
Despite facing setbacks with injuries – including a quadriceps tear and subsequent issues during pre-season – Oso persevered and earned his opportunity with the Sevilla first team. He made his debut on December 6, 2023, coming on as a late substitute in a 2-0 Copa del Rey victory over Atlético Astorga FC. [4] This appearance marked a significant milestone in his career, validating the faith placed in him by the club’s coaching staff. On February 23, 2024, Oso renewed his contract with Sevilla until 2027, further solidifying his commitment to the club. [4]
Oso’s breakthrough moment came on December 7, 2025, when he made his La Liga debut, starting in a 1-1 draw against Valencia CF. [4] This performance showcased his growing confidence and ability to compete at the highest level. His versatility and attacking prowess have quickly made him a fan favorite, and a valuable asset to Sevilla’s squad.
A Modern Full-Back: What Makes Oso Stand Out?
The term “modern full-back” is often used to describe players who excel in both defensive and attacking duties. Oso embodies this description, possessing the pace, stamina, and technical skill to contribute significantly to both phases of play. His ability to deliver accurate crosses, take on defenders, and even score goals makes him a constant threat to opposing teams.
Galván believes Oso’s potential is immense, but highlighted the need for continued development in the defensive aspects of his game. “If he manages to handle the defensive balance and defensive duels better… we can have a long-distance full-back with a lot of potential,” he stated. Improving his defensive positioning and tackling ability will be crucial for Oso to reach his full potential and become a consistent starter for Sevilla.
Sevilla’s Academy: A Consistent Source of Talent
Oso’s emergence is not an isolated incident. Sevilla has a long and proud tradition of developing talented players through its academy. The club’s commitment to youth development has consistently yielded players who contribute to the first team, and generate significant transfer revenue.
Galván noted the importance of academy players stepping up when the first team faces challenges, referencing past successes with players like Sergio Ramos, Jesús Reyes, and Antonio Puerta. “The academy always comes to the rescue,” he said. “If you have a coach from the academy, he knows what the player can provide you.”
What’s Next for Oso and Sevilla?
Oso will undoubtedly be a key player for Sevilla as they navigate the remainder of the La Liga season and compete in other competitions. His continued development will be crucial for the club’s success, and his versatility provides coach Quique Sánchez Flores with valuable tactical options. The club will be looking to build on Oso’s progress and integrate him further into the first-team setup.
Sevilla fans will be eager to see how Oso continues to evolve and contribute to the team’s success. His story is a testament to the power of perseverance, the importance of youth development, and the emergence of a truly exciting talent in Spanish football. The next confirmed match for Sevilla is against Real Betis on April 14, 2026, at the Benito Villamarín Stadium in Seville (21:00 CEST / 15:00 EDT).
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