Sung-Mun Song Remains A Perplexing Evaluation for Padres

The San Diego Padres signed Sung-Mun Song with unusual reasoning for a free agent: not because of who he was, but because of who he had proven he could become.

For several years, Song was a useful, versatile, disciplined player, but never one of the KBO's elite. Over time, he developed power, improved the quality of his contact and grew into one of the league's most complete players. Between 2024 and 2025, he hit 45 home runs, stole 46 bases and emerged as one of the KBO's most productive hitters.

That progression convinced San Diego to invest in him. Two months after his major-league debut, the question is no longer whether Song has gotten off to a good start. His numbers answer that on their own.

The real question is: How much do these first two months tell the Padres about the player they believed they were acquiring?

The answer remains far less obvious than his stat line suggests. Song has logged just over 60 plate appearances and has yet to settle into a regular role. He has split time between second base, shortstop and third base while also serving as a pinch-runner and pinch-hitter. For a player whose greatest strength has always been his ability to adjust, it's difficult to draw firm conclusions when his opportunities have been sporadic and his responsibilities change almost daily.

Song's First MLB Sample

His offensive production has been well below league average. Even so, the early indicators do not describe a completely different hitter than the one the Padres evaluated in Korea. Song owns an 13.8% walk rate and a 20.0% strikeout rate. The competition has changed, but the plate discipline that defined his offensive profile remains. His strikeout rate also remains reasonably close to where it was during his final two KBO seasons (10.6% in 2024 and 10.5% in 2025).

What has yet to appear is the trait that transformed his career. During his final years in Korea, Song evolved from a contact hitter into a legitimate power threat. That development changed the way evaluators projected his profile and made him an appealing international signing for San Diego.

Sixty-five plate appearances still aren’t enough to know whether that version of Song will carry over against major-league pitching.

Song’s Rise in Korea

The Padres already knew Song could control the strike zone, handle multiple defensive positions and provide versatility. None of those traits depended on a strong first month in the majors. Their real bet was different; whether the power and offensive impact he developed during his final two seasons in Korea would translate against the highest level of competition.

His production by position also helps explain why that question remains unanswered.

Production by Position

The sample is still far too small to draw conclusions, but it provides useful context. Song has looked more competitive at second base, where he has received most of his playing time. Third base, however, is his natural position. He started 194 games there over his final two KBO seasons. He made only 42 starts at second base and none at shortstop. His only recent experience there came in eight starts at Triple-A earlier this year.

Adjusting to major-league pitching is challenging on its own. Doing it while constantly changing positions, routines and defensive responsibilities only adds to the degree of difficulty. It doesn't fully explain his offensive struggles, but it does help explain why the Padres still lack enough information to evaluate the investment they made.

As such, the Padres are not evaluating a .214 hitter. Song's greatest strength has always been his ability to adapt to his situation. The Padres' uncertainty isn't whether he'll keep trying. It's how long it will take to find out whether that ability can still turn him into the player they believed they were signing out of the KBO.