Another small NBA 2K13 roster update arrived this morning which added Kenyon Martin to the New York Knicks roster. They also added the Golden State trade, who sent guard Charles Jenkins to Philadelphia and forward Jeremy Tyler to Atlanta.
Start > Run > Type : %appdata%, then find 2K SportsNBA 2K13Saves , overwrite all the files.
for XP users: C:/Documents and Settings / [your user name] / Application Data / 2K Sports / NBA 2K13 / Saves
for Vista or Win 7 users: C:/Users/[your user name]/AppData / Roaming / 2K Sports / NBA 2K13 / Saves
Then go to NBA 2K13 and load it