1959–1969: start in the provincial basketball In 1959, the
Club Deportivo Vasconia founded a basketball program under the presidency of Félix Ullivarriarrazua. Vicente Elejalde was appointed as head coach. A previous attempt to establish a basketball program, in 1951, had ended in failure. In its first season, the team finished second in the provincial championship behind Corazonistas. In the 1963–64 season, the team won its first provincial titles, taking both the league and cup. The team went on to win the provincial championship in five of its first ten seasons of competition (1959–69) and achieved the promotion to the 3rd division after Pepe Laso took over as head coach, prevailing over city rival
Deportivo Alavés. The team opened the 1972–73 season in the
1st division by defeating
Breogán 89–67. The Basque team went on to reach the semifinals of the
Copa del Rey where they were eliminated by
Estudiantes. In the 1973–74 season, the club reached 1,400 supporters and signed its first foreign player, the Canadian
Phil Tollestrup. The team finished in eighth place and gained the right to play in the
Korać Cup but declined to participate on financial grounds. In the summer of 1981,
José Antonio Querejeta, who had returned to the team after passing through
Real Madrid and had been tested by
FC Barcelona, was transferred to
Joventut. The direction of Iñaki Iriarte from the bench and the contribution of Cambronero Peio, Txomin Sautu, Salva Diez, Mikel Cuadra, Xabier Jon Davalillo and Luis Mari Junguitu allowed the team to promote to the
1st division and return to the place that it had occupied among the great teams for almost a decade. A new change in the presidency of the club allowed the arrival of José Antonio Apraiz. The season of the return to the top league was not very positive in terms of results, the team ended up in relegation positions with a baggage of three wins, three draws and twenty defeats. Spanish basketball was preparing to enter a new stage marked by professionalism, and the creation of the
Liga ACB made it possible for the team to avoid relegation back to the 2nd Division. The team started the 21st century with
Duško Ivanović on the bench. In his first year, they then found quick success in the newly reborn
EuroLeague. With a deep roster featuring
Elmer Bennett,
Saulius Štombergas,
Victor Alexander,
Fabricio Oberto and a young
Luis Scola, Baskonia reached the
2001 Euroleague Finals, before losing to
Virtus Bologna in the fifth and final game on the road. With winning momentum and the additions of
Dejan Tomašević and
Andrés Nocioni, the team achieved its first
double in the next season, with another Spanish King's Cup trophy and its first Spanish League title ever. Baskonia snatched two more Spanish King's Cups, in 2004 and 2006, as
Luis Scola and
Pablo Prigioni played decisive roles, and success followed the team in the
EuroLeague. Baskonia's arrival to its first EuroLeague Final Four in 2005 couldn't have been louder, as the team upset favored host
CSKA Moscow in the semi-finals, but couldn't overcome defending champ
Maccabi in the title game. Back home, Baskonia again reached the Spanish League finals, only to lose in dramatic fashion. Baskonia returned to the EuroLeague Final Four in 2006, but once again Maccabi stood in its way, this time in the semi-final. The team also made it to the Spanish League finals, but was swept there. The next season, Baskonia won its EuroLeague regular season and Top 16 groups before sweeping
Olympiacos in the Playoffs, as Scola became the
Euroleague Basketball's top all-time scorer at that time. Nonetheless, eventual champion
Panathinaikos downed Baskonia in the semi-finals and once home again in Spain, Baskonia lost in the semi-finals. In the third place game, Baskonia lost to Russian side
Lokomotiv Kuban. In the 2016–17 season, the
EuroLeague adopted a new league-style format in which a round-robin season of sixteen teams was played. In the first season in the new format, the team changed its core of players and also its head coach, but still remained deep in the playoff zone for most of the regular season and ended up advancing to the next phase with a 17–13 record and seventh place. A four-game winning streak in December and another in March covered up for a negative run of six losses in seven games between Rounds 17 and 23. Baskonia clinched a playoff berth for the 10th time in 12 seasons, but there the team was swept by
CSKA Moscow after three tough games.
Ádám Hanga was one of the team leaders and was chosen as the
EuroLeague Best Defender by the league's head coaches, and Baskonia showed, once again, its innate ability to sign talent that seemed to go under the radar for everybody else with names like
Shane Larkin,
Johannes Voigtmann and
Rodrigue Beaubois playing major roles. The 2018–19 season was an important season for the club with the
Final Four taking place on its home court. A slow start caused Baskonia to part ways with head coach
Pedro Martínez and bring back club legend
Velimir Perasović to replace him. Baskonia kept struggling on the road, but won 10 of its last 11 regular season games – including victories against playoff-bound teams
CSKA Moscow,
Panathinaikos and
Real Madrid – to reach the playoffs from sixth place. Baskonia managed to do something no team had done in over a decade – steal home-court advantage in a playoff series against
CSKA, but the Russian powerhouse recovered with back-to-back wins at
Buesa Arena to qualify for the Final Four and eventually win the title.
Vincent Poirier was chosen to the
All-EuroLeague Second Team. Baskonia had early exits in its two main domestic competitions; it lost against
Joventut in the
Copa del Rey quarterfinals and against
Zaragoza in the
Spanish League quarterfinals. On 30 June 2020, ten years after their last title, Baskonia won the
2019–20 ACB season, marked by the
COVID-19 pandemic. == Sponsorship naming ==