The Blue Jays have added another young arm to the pipeline, officially signing 18-year-old South Korean pitcher Si-Woo Kwon as an international free agent.
Toronto is betting on upside here. Francys Romero reported that Kwon will get a $330,000 signing bonus, the biggest bonus the club has handed out to a pitcher in the 2025-26 international signing period. It’s a notable investment for a player who has not yet thrown a pitch in North American pro baseball, but it fits a pattern the Blue Jays have leaned into in recent seasons.
Kwon’s stuff is what makes him stand out. Romero noted that his fastball can get up to 93 mph, and he backs it with a slider, curveball and splitter. His pitches come from a high release point, drawing a comparison to Blue Jays starter Trey Yesavage, and he also brings a strong physical frame to the table.
That combination has helped him miss bats against players his own age. The next step is proving those tools can play at a higher level, and that’s where the real question begins.
Kwon was expected to go in the first round of the upcoming KBO draft if he had stayed in South Korea, which tells you how highly he was regarded there. Instead, he’s headed to North America and into Toronto’s system.
The Blue Jays have made a habit of looking across the Pacific for talent. Last offseason, they added Cody Ponce after his MVP season in the KBO in 2025 and also signed Kazuma Okamoto from Nippon Professional Baseball. Okamoto made an immediate impact for Toronto this season, leading the team in home runs and standing out as one of the few bats in the lineup to post decent numbers.
Toronto also brought in Seojun Moon last August. The 6-foot-5, 18-year-old from South Korea signed for $1 million and spent his first summer in North America with the Blue Jays in the Florida Complex League. In 30.1 innings, he gave up 22 earned runs, walked 21 hitters and struck out 31.
Kwon is in the same age range as Moon and remains years away from any big league consideration, but his raw ability gives him a chance to move quicker than the timeline might suggest. And with Nolan Perry, Gage Stanifer and Johnny King already in the system, the Blue Jays’ collection of young pitching talent is starting to look pretty intriguing.
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