There has been a fantastic workaround floating around the community the past few days that allows the PC version of NBA 2K13 to have similar player shadow effects as the console versions. It is possible to manually override a few settings to force SSAO effects in NBA 2K13, but note that this currently works for Nvidia graphics card users only. The results look pretty good at the right angle, but keep in mind that this will have a negative effect on performance.
Below you can see a video example of the shadows in action. You can check out seanjohn1414‘s Releases Thread for many screenshots of this hack in action, and you can do it yourself by going to this Tutorial Thread or by watching the video tutorial by hitting Read More below.