Big Board 4.0: Top NBA draft prospects competing for No. 1

Chad Ford updates his draft rankings before conference tournaments start. AP Photo/Mark J. Terrill, File

We're getting closer to draft season.

Over the next few weeks, conference tournaments and March Madness will give players a major opportunity to boost their NBA draft stock.

I spoke with a number of NBA GMs and scouts to compile this updated ranking of the top prospects.

Here's our last Big Board of the college season.