Masan Yongmago’s Jang Hyun-seok struck out six and helped the team advance to the quarterfinals. Jang Hyun-seok pitched ⅔ of an inning of one-hit ball in relief against Daejeon High School in the round of 16 of the Presidential High School Games at Mokdong Stadium in Seoul on Friday. Yongmago won 5-1 and advanced to […]