Seung-hwan Oh

In the 2020 season, Oh is scheduled to wrap up his remaining 30 games of disciplinary action and take the mound from about mid-June. As scheduled, he will return to the game against Kiwoom on June 9.

On August 5, 2019, Oh returned to Korea and signed with the Samsung Lions of the KBO League, the team he has began his professional career with.

On February 26, 2018, Oh signed a one-year, $2 million contract with the Toronto Blue Jays that included a vesting option for the 2019 season.

On July 26, 2018, the Blue Jays traded Oh to the Colorado Rockies for Forrest Wall, Chad Spanberger, and a player to be named later or cash considerations. On July 16, 2019, it was announced that Oh would undergo surgery and miss the remainder of the 2019 season, and he was subsequently designated for assignment on July 23. He was released on July 26, 2019. In 2019, his cutter was on average the slowest in major league baseball, at 82.2 mph.

In 2017, he was 1-6 with a 4.10 ERA, and led the major leagues in intentional walks, with nine.

On January 11, 2016, Oh signed a one-year contract with the St. Louis Cardinals of Major League Baseball (MLB), with a club option for a second season. The Cardinals had scouted him for seven years while he pitched in Asia. During contract negotiations with St. Louis, Oh indicated that his goal was to become the first player to appear in the Korean Series, the Japan Series, and the World Series. He was initially assigned to help set up for incumbent closer Trevor Rosenthal. Oh made his Major League debut on Opening Day 2016 against the Pittsburgh Pirates. He pitched one inning, walking two batters and striking out two batters, while throwing 27 pitches. He earned his first major league win against the Atlanta Braves on April 10, pitching a scoreless inning in a 12–6 outcome.

With Hanshin in 2015, Oh appeared in 54 games, logging ​69  ⁄3 innings and striking out 66, walking 16 and allowing a 2.75 ERA. He saved another 41 games that year, breaking his own NPB single-season record for most saves by a Korean pitcher. In two seasons while playing in Japan, he had a 2.25 ERA with 80 saves. Through eleven total professional seasons in South Korea and Japan, he recorded 357 saves, a 1.81 ERA, and 10.7 strikeouts per nine innings in ​646  ⁄3 IP.

It was announced in April 2015 that Oh was in a relationship with Girls' Generation's Yuri. The couple were confirmed to have broken up in October 2015 after six months of dating due to the long distance in their relationship.

All throughout the 2014 season, he played the role as the Tiger's top closer. He became the second Korean player to break the 300-save mark after Lim Chang-yong in a 3–0 defeat of Yomiuri Giants on July 22, 2014. On the September 24 match with the BayStars, he picked up his 36th save of the season and broke the NPB record for saves by a foreign pitcher in his first year in the NPB. Eddie Gaillard (2000) and Dennis Sarfate (2011) each saved thirty-five games in a season. He also now holds the record for the most saves by a Korean pitcher in their first year in Japan, beating the previous record set by Lim, who had 33 saves in 2008 when he started playing for the Swallows. Oh notched a total of 39 saves for the season, breaking the NPB record for saves by a Korean pitcher in a single season set by Sun Dong-yeol (38 saves) with Chunichi in 1997.

The subject of a Korean investigation related to gambling, authorities interrogated Oh about his activities in Macau in November 2014 with fellow Korean baseball player Lim Chang-yong. Korean law is unusually strict in that it does not ban gambling per se, but it does ban going to casinos based outside of the country, even in places where gambling is legal. The Seoul Central District Prosecutors Office fined Oh and Lim in January 2016, and the KBO League suspended Oh for six months. With Japanese law toward gambling among athletes similarly restrictive, the Hanshin Tigers terminated his contract amid reports he was linked to a Korean crime organization.

On November 22, 2013, Oh signed a two-year, 990 million yen contract with the Hanshin Tigers, the biggest contract for a Korean baseball player in Japan. Tigers' manager Wada Yutaka suggested offering some Korean-language classes for his players to better communicate with their new teammate, especially the catchers and pitching coaches.

A right-handed pitcher, Oh stands 5' 10" (178 cm) and weighs 205 pounds (93 kg). His primary pitches include a four-seam fastball – averaging 92–93 miles per hour (148–150 km/h) and topping out at 96 miles per hour (154 km/h) – and a mid-80s slider with a darting motion resembling a cutter.

While Oh was still playing for the Lions, they became KBO League champions four more times. The Lions defeated the Fukuoka SoftBank Hawks, the Nippon Professional Baseball champions, to earn the Asia Series championship in 2011, and become the first non-Japanese team to win. Oh earned his second Korean Series MVP Award in 2011.

Recording his 100th save in fewer games than anyone in KBO League history, Oh became the KBO League's all-time saves leader with 277. He collected his 200th save in his 333rd career appearance, making him the fastest player in all of the world's top professional leagues to achieve that total, surpassing the mark of 359 forged by Jonathan Papelbon of Major League Baseball.

A shoulder injury began interfering with Oh's performance in 2009 and continued into 2010. He had his second elbow surgery to remove bone spurs in 2010 and returned to the playoffs in the same year.

He also posted a stellar 1.69 ERA in 444 games over the nine seasons that he played for Samsung Lions. Every season with the Lions, Oh turned in an ERA under 2.00, except 2009–10, which were shortened by injuries.

Prior to his second season, Oh was selected to the roster of the South Korea national baseball team for the inaugural World Baseball Classic. That year, he achieved the first of two consecutive seasons with 40-plus saves, 2006 and 2007. His 47 saves in 2006 set a KBO League record for one season, a total he repeated in 2011.

The Samsung Lions selected Oh in the second round (5th pick, 12th overall) of the 2005 KBO First Year Players draft. After signing with the club, he contributed a strong rookie season as a setup man and closer in 2005, going 10–1 with a 1.18 ERA, 16 saves (sixth in the league) and 115 strikeouts (fifth in the league) in 99 innings pitched over 61 games. In the 2005 Korean Series, he pitched seven scoreless innings with 11 strikeouts, appearing in three games as a closer to lead his team to the championship. He won the Korean Series Most Valuable Player Award. After the season, Oh was named the KBO League Rookie of the Year.

In 2004, his senior year at Dankook University, Oh won most of the Korean college pitching awards. In June, Oh made his first appearance for the South Korea national baseball team at the 2004 World University Baseball Championship held in Tainan, Taiwan. He led his team to the bronze medal, playing most of the games in closer duty.

In 2003, he came back to the mound, pitching limited innings as a relief pitcher.

Upon graduation from high school, Oh started his collegiate career at Dankook University, but missed the entire 2001 and 2002 seasons after undergoing Tommy John surgery in 2001.

Oh attended Kyunggi High School in Seoul, South Korea. He had been a pitcher since he began baseball, but he switched to the outfield after getting serious arm injuries in 1999. He joined the 2001 KBO draft at the end of his last high school season, but, despite intriguing some MLB scouts, went undrafted, and Oh elected to attend college instead.

Seung-hwan Oh (Hangul: ; Korean: 오승환 ; Hanja: 吳昇桓 ; Korean pronunciation: [o.sɯŋ.ɦwan] ; born July 15, 1982) is a South Korean professional baseball relief pitcher for the Samsung Lions of the KBO League. He previously played for the Lions in South Korea, the Hanshin Tigers of Nippon Professional Baseball (NPB) in Japan, and the St. Louis Cardinals, Toronto Blue Jays, and Colorado Rockies of Major League Baseball (MLB). He is known as "Dol-bucheo" (Stone Buddha) for being unshaken and maintaining an emotionless face in every situation. His prowess as a relief pitcher also earned him the nickname "Kkeut-pan Wang" (Final Boss), in South Korea and among Cardinal fans.