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Take note, celebs -- here's how ya throw a first pitch ... with K-pop idol Wooyoung from ATEEZ hurling it right over the plate ahead of Korea's World Baseball Classic matchup with Australia!!
The popular musician rocked a custom No. 99 Korea jersey and jeans as he took the mound on Monday ... with the crowd cheering him on as he got ready for his big moment.
The windup and form looked great as he executed a throw right down the middle.