Seoul – Riley O’Brien, the St. Louis Cardinals reliever who was poised to be a key closing pitcher for the South Korean national baseball team in the upcoming World Baseball Classic (WBC), has withdrawn from the roster due to a calf injury. The news, confirmed by the Korea Baseball Organization (KBO) on Thursday, February 19, 2026, is a significant blow to manager Ryu Ji-hyun’s plans for the tournament. O’Brien, who was named Korea’s closer on February 6, 2026, expressed his regret at being unable to represent the country.
The injury occurred during a live bullpen session at the Cardinals’ spring training facility in Jupiter, Florida, on Saturday, February 14, 2026, according to MLB.com. O’Brien described the strain as mild, stating, “It felt better today than it did yesterday. Hopefully, it’s nothing too long-term,” but his availability for the WBC, which begins March 5 in Tokyo, is now in doubt. This setback adds to a growing list of pitching concerns for the Korean team as they prepare for the international competition.
A Pivotal Role Lost
O’Brien’s selection for the national team was a notable one, as he is one of four players born in the United States to a Korean mother. The WBC’s eligibility rules allow players to represent the country of their parents’ birth, even if they were not born there themselves. Alongside O’Brien, Detroit Tigers outfielder Jahmai Jones, Houston Astros utility player Shay Whitcomb and Seattle Mariners pitcher Dane Dunning were similarly selected based on this criteria. Manager Ryu Ji-hyun had specifically highlighted O’Brien’s dominance in the majors, stating he would be utilized in high-leverage situations between the seventh and ninth innings.
In 2025, O’Brien had a breakout season with the Cardinals, posting a career-best 2.06 ERA over 42 appearances and 48 innings pitched, while also recording six saves. His performance solidified his position as a potential closer for the Cardinals, and led to his selection as Korea’s closer for the WBC. The Cardinals are also monitoring the injury, as it could impact their own bullpen plans for the upcoming Major League Baseball season.
Impact on the Korean Roster
The loss of O’Brien creates a significant void in the Korean bullpen. Manager Ryu will now need to reassess his pitching staff and identify a replacement closer. The team had been relying on O’Brien’s experience and success in high-pressure situations. The KBO has not yet announced a replacement for O’Brien on the roster.
San Francisco Giants outfielder Lee Jung-hoo was previously named captain of the team, adding another experienced player to the lineup. Ryu had also emphasized the need for right-handed bats, which Jones and Whitcomb were expected to provide. Although, the injury to O’Brien underscores the challenges of assembling a competitive team with players from diverse backgrounds and schedules.
What’s Next for the Korean Team
South Korea is scheduled to play tune-up games in Osaka, Japan, in the days leading up to the start of the WBC on March 5. The team will need to quickly adjust to the absence of O’Brien and find a reliable closer before facing tough competition in the tournament. The KBO will likely announce further updates on O’Brien’s condition and potential roster changes in the coming days. The team’s performance in the WBC will depend on its ability to overcome this setback and capitalize on the strengths of its remaining players.
The situation highlights the inherent risks involved in international tournaments, where players are often dealing with the demands of their professional leagues while also representing their countries. Fans and analysts will be watching closely to notice how the Korean team responds to this challenge and whether they can still contend for a championship.
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