Career
He played for CPBL"s Uni-President 7-Eleven Lions for nearly 18 years as a player, a coach, manager, and later assistant general manager. He played for the Lions throughout his entire professional career, and was given the position of manager right after his first retirement as player in 1999. He resigned from manager position in late 2002 after the Lions" poor performance during that year and returned as a player again in 2003, at age of 44 and miraculously hit a home run during that year, setting CPBL"s record of being the oldest player to hit a home run.
He retired again after the 2004 season.
In 2005 and 2006 Tseng served as the assistant general manager of the Lions. He currently coaches college baseball teams in his Chiayi County hometown.