Regular season For the
inaugural season, the regular season was played from November through to January over ten weeks, similarly to the
2010 season of the
Claxton Shield. With the expansion from five to six teams, each team played every week as opposed to the two
bye weeks the teams had previously. In addition, rather than a three-game series each week, the series were four games each, resulting in each team playing 40 games over the season. As had been the case in 2010, the majority of games were played on Fridays and Saturdays, though some games were also played on Thursdays and Sundays, depending on the team hosting and whether or not a
doubleheader was included in the series. The
2011–12 season largely followed the same format as the 2010–11 season, with only minor changes. Though the opening game of the season was scheduled again be the only game played that day, the whole series was played over the same weekend along with the first series for each of the other four teams. To allow for the
Perth Heat's participation in the
Asia Series, each of the teams had a bye weekend during the first half of the season. The season expanded from 40 to 45 games per team; one of the two series played against each opponent expanded from 4 to 5 games. The
2012–13 season also had minor modifications from the previous season. Each team's bye weekends were in the first three rounds of competition, and each series held during these weekends were only 3 games long, and were billed as "... against their two closest geographical neighbours; building upon both traditional and newly established rivalries." The match-ups for these games echoed the divisions used in the
2008 Claxton Shield, where teams based in Brisbane, Canberra and Sydney were in the Eastern Division, and teams from Adelaide, Melbourne and Perth were in the Southern Division. The remaining 10 weeks were made up of 4-game series, like the 2010–11 season. By the end of the season, each team had played each other team at least eight times, with an additional three against both of their geographic rivals.
All-Star Game In the league's second season, it was announced that an All-Star Game would take place, to be held in
Perth on 21 December 2011. Like the
Major League Baseball All-Star Game, it would be held midway through the regular season, and would feature the best players in the league. Rather than the teams in the All-Star Game being made up of players from certain teams, the game would be contested by
Team Australia and a team of World All-Stars, selected from the import or international players participating in the ABL at the time.
Postseason For the first two ABL seasons, the postseason involved the top four teams in a three-round structure following the
Page playoff system. In the inaugural season, each round consisted of a best–of–three-game series between the respective teams, however this was changed in 2011–12 such that the first two rounds were decided in a best–of–five series, with the championship series remaining best–of–three. The first- and second-placed teams played each other in the major semi-final series, with the winner proceeding directly to the championship series and the loser to the preliminary final series. The winner of the minor semi-final series between the third- and fourth-placed teams also went to the preliminary final series, while the loser was eliminated. Likewise, the winner of the preliminary final series qualified for the championship series, the loser eliminated. The third season used a shortened format from the two previous seasons. Only the top three teams qualified for a two-round postseason, with each round consisting of a best–of–three-game series. The first-placed team directly qualified for the championship series, and the second- and third-placed teams played each other in the preliminary final series, the winner of which qualified for the second place in the championship series. For the 2017–18 season, the ABL announced that the top four teams at the end of the regular home and away season would qualify for the semifinals, providing more opportunities for teams to compete for Championship glory. Teams will be seeded from #1 to #4 based on their record and finishing order in the home and away season. The #1 Seed and #2 Seed will be awarded home semi-finals, and will host all three games in a best of three series. The ABLCS will be a home and away split series with the Highest Seeded Winner awarded the choice to host either Game 1, OR Games 2 and 3. } The winner of the championship series is named the ABL Champion for that season, and is awarded the Claxton Shield; the prize given to the top Australian baseball team since 1934. The event had previously been contested between the winners of
Nippon Professional Baseball's (NPB)
Japan Series,
Korea Professional Baseball's (KBO)
Korean Series,
Chinese Professional Baseball League's (CPBL)
Taiwan Series, and
China Baseball League's (CBL) championship series. The
2011 tournament did not feature the CBL's champions, but officials stated that a team would participate in future editions. Unlike all four previous editions of the tournament which were held in Japan, the 2011 edition was held in Taiwan. The tournament follows a
round-robin format, where each team plays each other once. The top two teams then face each other in a single game to decide the champion. The Asia Series is held in November, which would otherwise create a conflict for the ABL champion team as the following season would have already commenced. To avoid this, the League announced that during the 2011–12 season, the Perth Heat—2010–11 champions—would be scheduled to have a bye while competing in Taiwan. ==Roster formation==