Antonio Tarver -- Released from Jail ... 'I'll Box to Repay My Debt'

Antonio Tarver has just been released from a Florida jail ... and tells TMZ Sports he plans to hit the gym tomorrow to restart his boxing career so he can pay back his $200,000 debt.

Tarver was locked up in FL on a warrant from Nevada -- stemming from allegations he never repaid the Wynn Las Vegas on a $200,000 gambling marker from a 2012 gambling binge.

But Wednesday evening, Tarver says famed boxing manager Al Haymon spotted him the cash to post bail -- and he was released from the Pinellas County Jail. We confirmed Tarver has been released.

When we spoke with Tarver, the 45-year-old insinuated that Haymon ALSO spotted him the cash to repay the entire $200k debt to Wynn.

"It was a debt that I had," Tarver admits ... "a hiccup in the road."

Tarver says he's hard up for cash -- and hasn't "made a dime in two years" -- but vows to repay his debt to Haymon with his fists.

"With Al, it's all about friendship first ... I'm gonna pay him back by becoming the next heavyweight champion."