Koivisto was known for his speed and excellent technique during his career. On the downside, his small size made it hard for him to cover the net well. High shots proved to be another issue. Effectively retired from hockey due to personal reasons in late 2011.
- 2011-05-05 • Signed to a two-year contract by Blues
- 2008-05-05 • Signed to a three-year contract by Kärpät
- 2008-05-05 • Released by TuTo
- 2008-01-29 • Signed to a one-year contract extension by TuTo
- 2007-04-13 • Signed to a one-year contract by TuTo
- 2006-08-03 • Signed to a one-year contract by Hokki
- 2008-10-08 • Loaned to Hokki by Kärpät