One unusual feature of Korean baseball is that each year, several under-performing players change their names, presumably hoping to reinvent themselves, start over, or simply distance themselves from their past performance. In 2013, a new high of 11 players changed their names (far above the 5 in 2012, 3 in 2011, and 4 in 2010).
-  김영민 => 김세현 (Kim Young-min => Kim Se-hyun)
-  김영관 => 김지성 (Kim Young-gwan => Kim Ji-sung)
-  이승화 => 이우민 (Lee Seung-hwa => Lee Woo-min)
Although the cause may be disputed, the numbers don't lie. These players clearly did better after their name change.
-  이학준 => 이시찬 (Lee Hak-jun => Lee Si-chan)
-  김희걸 => 김건한 (Kim Hee-geol => Kim Gun-han)
-  장효훈 => 장시환 (Jang Hyo-hun => Jang Si-hwan)
-  전승윤 => 전유슈 (Jeon Seung-yoon => Jeon Yoo-soo)
-  박정태 => 박근홍 (Park Jung-tae => Park Geun-hong)
-  진민호 => 진해수 (Jin Min-ho => Jin Hae-soo)
-  손광민 => 손아섭 (Son Gwang-min => Son Ah-seop)
These players' name changes did not create a notable break in their careers (yet?).
-  장기영 => 장민석 (Jang Ki-young => Jang Min-suk)
-  김상현 => 김태영 (Kim Sang-hyun => Kim Tae-young)
-  윤상균 => 윤요섭 (Yoon Sang-kyun => Yoon Yo-sup)
-  박남섭 => 박준서 (Park Nam-seop => Park Jun-seo)
-  에릭 => 해커: Eric Hacker finally decided he wanted his last name on his jersey.
Note: The listed year denotes the first season in which the player used his new name.