2K Games has announced that NBA 2K13′s servers will be shut down at the end on March 31st, 18 months after the game released. The announcement was made on Twitter earlier today with confirmation that after the shut down owners of NBA 2K13 will not be able to play ranked matches.
— 2K Support (@2KSupport) February 28, 2014
It’s not uncommon for game servers to be shut down after a while, but it does seem a bit soon for 2K13′s online functionality to disappear. To put that in perspective FIFA 12 which released in 2011 had its servers shut down just this week, while Gran Turismo 5′s servers will be going offline three and half years after being switched on. It could be that demand suddenly dropped for NBA 2K13′s online when 2K14 launched, however there is no official confirmation of that.
Source: 2K Twitter