The cost of forgetting the basics was high.

LG Twins pitcher Son Ju-yeong forgot the basic 1st base cover. He became the losing pitcher by allowing the runner caught in a pick-off to advance.

In the game held on the 21st at Jamsil Stadium in Seoul between the Doosan Bears and LG Twins, the two teams traded a point each in the 1st inning. Doosan took the lead in the 4th inning with a two-run double by Cave, but LG reclaimed the lead in the bottom of the 4th with a three-run home run by Park Dong-won. In the top of the 5th, Doosan tied the game 4-4 with a ground ball to 2nd by Kim Dong-jun with one out and runners on 2nd and 3rd.

In the top of the 6th, Son Ju-yeong came on as a relief pitcher. After a ten-day rest, Son Ju-yeong, who was registered to the first team roster that day, was already scheduled to pitch for about one inning out of the bullpen due to the long interval since his last start. Manager Youm Kyoung-youb said before the game, "I plan to throw within 30 pitches for one inning against left-handed batters."

Son Ju-yeong gave up a single to the leadoff batter Kim Jae-hwan. After getting Cave out with a ground ball to 2nd, he faced a crisis with runners on 1st and 3rd after giving up a single to Lee Yoo-chan with one out.

With Oh Myung-jin at bat, a pick-off throw caught the runner on 1st base. 1st baseman Austin threw to 2nd when trying to tag the runner. However, Son Ju-yeong did not cover 1st base and ran toward the area between 1st and home. 1st base was open, and as Gu Bon-hyeok was unable to make the throw, the runner on 1st base safely returned to 1st. It was Son Ju-yeong's mistake.

Oh Myung-jin hit an infield single to shortstop, allowing the runner on 3rd to score. In a run-and-hit play, the runner on 1st base stole 2nd as shortstop Gu Bon-hyeok dove in an attempt to make the play at 2nd. Although Gu Bon-hyeok made a diving catch to secure the ball temporarily, it slipped from his glove as he stood up.

As the score became 6-5, LG replaced pitcher Son Ju-yeong with Kim Jin-sung. With a pinch hitter, Lim Jong-sung at bat, the runner on 2nd successfully stole 3rd base on the second pitch forkball, and then the runner on 1st also successfully stole 2nd on the third pitch (forkball).

Lim Jong-sung's infield single to 3rd allowed the runner on 3rd to score, putting Doosan ahead 6-4. 3rd baseman Moon Bo-gyeong misplayed the ball slightly to the side while trying to make the play, resulting in a safe call at 1st base.

In the bottom of the 9th, with 2 outs and runners on 1st and 2nd, LG scored with a clutch hit from Moon Bo-gyeong to narrow the gap to 5-6, but Moon Sung-ju's ground ball to shortstop ended the game. Son Ju-yeong became the losing pitcher, allowing 3 hits and 2 earned runs in ⅓ inning.

With this defeat, LG fell one game behind the leading Hanwha Eagles. Hanwha's game against Kiwoom was canceled due to rain that day. Had LG won, they could have been tied for 1st with Hanwha, but they missed the opportunity.

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