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|Current season, competition or edition:
2015 KBO League season
1981 (KBO founded)
|No. of teams||10|
|Most recent champion(s)||Doosan Bears (4)|
|Most titles||Kia Tigers (10)|
|TV partner(s)||KBS, MBC, SBS, Sky Sports, SPOTV|
|Founder||Korea Baseball Organization|
The KBO League (Hangul: KBO 리그), originally called the Korea Baseball Championship (Hangul: 한국야구선수권대회; Romanization: Hanguk Yagu Seonsukkwon Daehoe) is the highest level league of baseball in South Korea. The KBO League was originally founded with six franchises in 1982 and currently has ten franchises throughout the nation. Nine of the ten franchises are named after the companies or business conglomerates which own them, while one sold their naming rights (Nexen Heroes).
The inaugural franchises were:
- Haitai Tigers, based in Gwangju
- Lotte Giants, based in Busan
- MBC Chungyong, based in Seoul
- OB Bears, based in Daejeon
- Sammi Superstars, based in Incheon
- Samsung Lions, based in Daegu
In 1985, the Sammi Superstars became known as the Cheongbo Pintos. The next year, 1986, saw some major changes, with the OB Bears moving from Daejeon to share the Seoul's Jamsil Baseball Stadium with MBC Chungyong in Seoul. A new franchise, the Binggrae Eagles, joined to replace vacancy of Daejeon by OB's moving and expanding the league to seven franchises. 1988 saw the Cheongbo Pintos change ownership again, becoming the Pacific Dolphins. In 1990, MBC Chungyong became the LG Twins and an eighth franchise was added, the Ssangbangwool Raiders who represented the Jeollabuk-do region.
There was little change in the 90's except for a few major sponsors: 1993 saw the Binggrae Eagles become the Hanwha Eagles, in 1995 the Pacific Dolphins became the Hyundai Unicorns and the OB Bears in 1999 became the Doosan Bears. Bigger changes were affected in 2000 when the Hyundai Unicorns moved from Incheon to Suwon, and a new franchise, the SK Wyverns took their place in Incheon. The Ssangbangwool Raiders became defunct. In 2001, the Haitai Tigers became the Kia Tigers.
In 2008, the Hyundai Unicorns franchise was disbanded, re-founded the Woori Heroes and moved to Mok-dong in Seoul, after a disappointing season in 2007 both on and off the field. Despite winning championships in 1998, 2000, 2003 and 2004, fans never really took to the franchise after their move from Incheon. Also, while the franchises in Busan, Daegu, Daejeon, and Gwangju did not have to compete with other franchises for fans, the Suwon-based Unicorns struggled to compete with the nearby Seoul franchises.
Founding member the KIA Tigers (formerly the Haitai Tigers) had won 10 of the 29 national championships.
Many of the players who excel in the Korean league go on to play for franchises in Nippon Professional Baseball in Japan. Such players in the NPB include Lee Seung-yuop for the Yomiuri Giants, Kim Tae-kyun for the Chiba Lotte Marines, Lim Chang-yong for the Tokyo Yakult Swallows, and Tyrone Woods also for the Chunichi Dragons (former Doosan Bears player).
Starting with the 2015 season, each team plays 144 games in the regular season, increased from 128 due to an expansion team. Each team plays every other 16 times.
KBO All-Star Game
On mid-July every year, the best players participate in the KBO All-Star Game. The franchises participating are divided into two sets of teams: Dream All-Stars (Doosan, KT, Lotte, Samsung, and SK) and Nanum All-Stars (Kia, Hanwha, LG, NC and Nexen). Unlike in the MLB, the KBO All-star game does not determine home-field advantage in the KBO Korean Series.
The KBO League's season culminates in its championship series, known as the KBO Korean Series. Currently, the top four teams qualify for the post-season based on win/loss records. The team with the best record gains a direct entry into the KBO Korean Series, while the other three teams compete for the remaining place in a step-ladder playoff system:
- KBO Wild Card Game: 4th place team (starts with a one-game advantage.) vs. 5th place team; 2 games
- KBO Playoffs Stage 1: 3rd place team vs. winner of KBO Wild Card Game; best of 3 out of 5 games
- KBO Playoffs Stage 2: 2nd place team vs. winner of KBO Playoffs Stage 1; best of 3 out of 5 games (reduced from 7 games starting from 2009)
- KBO Korean Series: 1st place team vs. winner of KBO Playoffs Stage 2; best of 4 out of 7 games.
Any playoff games ending in an official tie are replayed, thereby raising the possibility of a close series containing more than the originally scheduled 5 or 7 games.
Traditionally, Korea Professional Baseball games have a maximum number of extra innings before a game is declared an official tie. The KBO abolished this limit for the 2008 season, however it was reinstated in 2009, with a 12-innings limit imposed during both regular season and playoff games. However, no extra innings are played in the first game of a double-header, with games limited to 9 innings. Starting from the 2009 season, tied games count as a loss for both teams for percentage calculation purposes; from 2002 until 2007 they were considered a "no game"; prior to this they counted as half a win and half a loss.
The league places a cap on the number of foreign players allowed on club rosters. The foreign player limit is currently set at three, increased from 2 players from 2014.
All teams use the designated hitter rule.
|Nanum All-Stars[note 1] (1982–present)|
|Dream All-Stars[note 2] (1982–present)|
|Single league (1982–1998, 2001–present)[note 3]|
|Doosan Bears [note 4]||Seoul||Kim Tae-hyeong||1982|
|Hanwha Eagles [note 5]||Daejeon||Kim Sung-keun||1985||1986|
|Kia Tigers [note 6]||Gwangju||Kim Ki-tae||1982|
|KT Wiz||Suwon||Cho Beom-hyeon||2013||2015|
|LG Twins [note 7]||Seoul||Yang Sang-moon||1982|
|Lotte Giants||Busan||Lee Jong-un||1975||1982|||
|NC Dinos||Changwon||Kim Kyung-moon||2011||2013|
|Nexen Heroes||Seoul||Yeom Kyung-yup||2008|
|Samsung Lions||Daegu||Ryu Joong-il||1982|
|SK Wyverns||Incheon||Kim Yong-heui||2000|
|Hyundai Unicorns [note 8]||Suwon||1982||2008|
- Former Western League 1982–1998, 2001–2014
- Former Eastern League 1982–1998, 2001–2014
- Formerly, KBO have implemented dual league. The league name was Dream League and Magic League. (1999–2000)
- Known as the OB Bears until 1998; Located in Daejeon until 1984
- Known as the Binggrae Eagles until 1993
- Former Haitai Tigers 1982–2000
- Former MBC Chungyong 1982–1989
- Former Sammi Superstars 1982–1985, Chungbo Pintos 1985–1987, Pacific Dolphins 1988–1995; Located in Incheon until 1999
|Doosan Bears / LG Twins||Hanwha Eagles||Kia Tigers||KT Wiz||Lotte Giants|
|Jamsil Baseball Stadium||Hanwha Life Eagles Park||Gwangju-Kia Champions Field||Suwon KT Wiz Park||Sajik Baseball Stadium|
|Capacity: 26,000||Capacity: 13,500||Capacity: 22,000||Capacity: 20,000||Capacity: 27,000|
|NC Dinos||Nexen Heroes||Samsung Lions||SK Wyverns|
|Masan Baseball Stadium||Gocheok Sky Dome||Daegu Samsung Lions Park||Incheon SK Happy Dream Park|
|Capacity: 11,000||Capacity: 18,076||Capacity: 24,000||Capacity: 27,500|
- Most successful clubs
|Club||Champions||Runners-Up||Winning Seasons||Runners-Up Seasons|
||1983, 1986, 1987, 1988, 1989, 1991, 1993, 1996, 1997, 2009|
||1985, 2002, 2005, 2006, 2011, 2012, 2013, 2014||1982, 1984, 1986, 1987, 1990, 1993, 2001, 2004, 2010, 2015|
||1982, 1995, 2001, 2015||2000, 2005, 2007, 2008, 2013|
|Hyundai Unicorns (defunct)||
||1998, 2000, 2003, 2004||1994, 1996|
||2007, 2008, 2010||2003, 2009, 2011, 2012|
||1990, 1994||1983, 1997, 1998, 2002|
||1984, 1992||1995, 1999|
||1999||1988, 1989, 1991, 1992, 2006|
Asia Series record
KBO-NPB and CPBL-KBO CC record