Béisbol Doble A ("Double-A Baseball"), governed by the Federación de Béisbol Aficionado de Puerto Rico (Puerto Rico Amateur Baseball Federation), is a Puerto Rican amateur baseball spring and summer baseball league, founded in 1940 and based in San Juan. The season normally starts in mid to late February and ends with the Carnaval de Campeones (Carnival of Champions) final in September. They play a weekend schedule (Friday, Saturday and Sunday), and their all-star game is held soon after the regular season and before the playoffs. The actual defending champions 2023, Arenosos de Camuy, obtained their first league championship in their history (Founded in 1957).
The league is composed of 45 teams grouped into 8 divisions: 3 with 5 teams (Northwest, Southwest and Southeast), and 5 with 6 teams (North, South, Metropolitan, East and Central).
During the regular season, normally between February and May, each team plays 20 games for a total of 450 scheduled games. In extra innings, the international runners-on-first and second base rule will apply to the offensive team. Beginning with the 2024 season, interdivisional games are scheduled as regular games.
The first four teams in each division (32 teams) will advance to the first stage of the postseason. It will be played as follows: section semifinal (best of 5 games), section final (best of 7 games). The champion of each division (8 teams) will advance to the Carnival of Champions. Usually, these two series are played between May and June.
To the second stage of the post-season, the 8 divisional champions advance to the Carnival of Champions. Each team will play 7 games, one with each other in a round robin series. The first 4 places advance to the National Semifinal (best of 7 games) and the two winners advance to the National Final (best of 7 games) to decide the National Champion.
Juncos is the team with the most league championships with 10, including a back-to-back (1947-48) and a three-peat (1989-90-91). Cidra follows with 9 championships, including 3 back-to backs (2005-06, 2008-09, 2012-13). Next are Juana Díaz and San Lorenzo with 6 championships each.
Other teams with back-to-back championships include Manati (1971-72) and Vega Alta (1962-63). San Lorenzo is still the only team to achieve a four-peat (1999, 2000, 01, 02).