Codes for NBA 2k10 have appeared that can open blocked teams and an extra ball.
NBA 2k10: Cheat Codes Free Download
Cheat Codes must be entered in the Options> Codes menu
Cheat Codes for NBA 2K10:
payrespect – Open ABA ball
2ksports – Open a 2K Sports team
nba2k – Open 2k Development Team
vcteam – Open Visual Concepts command
2kchina – Open 2K China Team