Yoon Sung-bin is showing potential as a bullpen pitcher for the Lotte Giants' 'sore finger' Yoon Sung-bin (26). He recorded a scoreless outing in back-to-back games.

On the 7th, Yoon Sung-bin took the mound as a relief pitcher in the game against the NC Dinos of the 2025 Futures League held at Gimhae Sangdong Stadium, recording 1⅔ innings (32 pitches), allowing 2 hits, 3 strikeouts, and no runs for a hold. He has been scoreless in both games pitched on consecutive days.

The Giants were leading 4-1 when pitcher Lee Young-jae allowed a leadoff homer to Ahn In-san in the fifth inning, and after allowing an RBI hit on one out with runners at first and second, the score tightened to 4-3.

Yoon Sung-bin took the mound with one out and a runner on first. He induced Park Joo-chan into a ground ball to third base, getting the lead runner out at second. After allowing a hit to Ko Seung-wan, creating a two-out, one and third base crisis, he kept the lead by getting Kim Beom-jun to pop out to second base.

In the sixth inning, Yoon Sung-bin faced leadoff hitter Song Seung-hwan, who hit a triple over the center fielder's head. With no outs and a runner on third, it was a tie crisis. Yoon Sung-bin dominated with overwhelming pitching, achieving 'KKK' without allowing any runs. He struck out Han Jae-hwan looking on a 2 balls-2 strikes count, struck out Ahn In-san swinging on a 2 balls-2 strikes count, and struck out Shin Min-woo swinging on a full count.

In the match against NC on the 6th, Yoon Sung-bin pitched 2 innings (28 pitches), allowing 1 walk and recording 3 strikeouts, keeping a scoreless performance. He faced the leadoff hit by walk in the 8th inning while leading 3-2. With no outs and a runner on first, he secured 2 outs with a strikeout and a pop-out to third base. He finished the inning after the runner on first failed to steal second.

Yoon Sung-bin, who was responsible in the 9th inning, ended the game with a strikeout, a strikeout, and a foul fly to right field. He recorded a save with 2 scoreless innings in a one-run game. This was also his first career save in the Futures League.

Yoon Sung-bin made his first start on May 20 against LG at Sajik, pitching 1 inning, allowing 4 hits, 6 walks, 1 hit batsman, and recording 9 earned runs. He threw fastballs up to 157 km/h but was early pulled from the game due to chronic control issues.

Later, Lotte manager Kim Tae-hyoung sent Yoon Sung-bin down to the second team, ordering him to try pitching as a bullpen pitcher. This was to help him overcome pressure while pitching in relief situations during games. Yoon Sung-bin, who joined Lotte as the first overall pick in the 2017 rookie draft, possesses a powerful fastball in the high 150 km/h range but has not been able to showcase his potential in 9 years due to control issues.

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