Mark Cuban -- DeAndre Jordan Blew Me Off Yesterday

Mark Cuban is finally opening up about what happened between him and DeAndre Jordan last night -- claiming the NBA star didn't pick up his call ONCE ... and says he hasn't heard from him since Tuesday night.

As you know, Jordan backed out of a verbal deal with the Mavs that would have paid him $80 million over 4 years ... after having an emergency meeting with the L.A. Clippers last night.

Moments ago, the Mavs owner went to CyberDust and said, "There will be a time when I detail everything I know regarding the last 48 hours."

"I don't think the time is right to say anything beyond the facts that [Jordan] never responded to me at all yesterday. Not once. To this minute I have not heard anything from him since Tuesday night."

Sources connected to the situation tell TMZ Sports Cuban was BLOWING UP DeAndre's phone yesterday -- calling several times throughout the day and night.

Cuban also talked about the Mavs other big free agent acquisition, Wes Mathews -- saying Dallas should NOT worry about Wes backing out like DeAndre.

"I specifically told Wes that I would not hold him to his commitment if he wanted to go elsewhere."