2K Support has announced that the servers for NBA 2K14 have now been discontinued. This means that gamers can no longer play ranked online games, or take part in online leagues.
— 2K Support (@2KSupport) March 31, 2015
The titles that currently maintain online functionality are NBA 2K15, WWE 2K15, WWE 2K14, Top Spin 4, and Top Spin 3. To remain up to date with 2K’s server status, be sure to check out this page on 2K.com.