Chinatrust Whales
Ni was drafted by the CPBL team Chinatrust Whales in 2005. He signed with the team in early 2007 and played for the entire CPBL 2007 and 2008 seasons. In the two years Ni had a 12–24 record with seven holds, four saves and a 3.43 ERA in inning pitched. Ni won the CPBL strikeout Champion Award in 2008 season with 132 strikeouts.