Buccaneers general manager Mark Dominik was reviewing the first three rounds of the 2013 NFL draft late Friday when he noticed what to him was a disturbing trend.

With nine defensive tackles already off the board, a position group that Dominik once considered deep was now looking rather thin, so he knew he'd have to get aggressive to avoid being shut out of it.

No problem there.

Dominik had already made more than half a dozen draft-day deals since taking over as Bucs GM in 2009 and he only enhanced his reputation as a draft-day wheeler and dealer by making three more trades Saturday.

“Just as I said last year, I thought Mark did a masterful job,” Bucs coach Greg Schiano said of Dominik, who worked deals for Illinois defensive tackle Akeem Spence, Patriots running back Jeff Demps and University of Miami running back Mike James.

“Now, a lot of that is patience, but that's hard, because I know who we want and as a coach you're dying (because) we've got to get that guy and Mark just says, 'It's OK, we're going to get him.' It's all a matter of managing the phones and the other GMs and again, Mark was awesome.”

Dominik cut his first deal of the day with the Oakland Raiders, swapping the 112th pick for the 100th and giving Oakland one of his two sixth-round picks for the opportunity to draft Spence.

He then traded running back LeGarrette Blount to the Patriots for running back/Olympic track star Jeff Demps and a seventh-round pick that eventually went to Minnesota in a deal that allowed the Bucs to trade up and take James in the sixth round.

“I've found myself to be mostly calculated,” Dominik said. “I think that's better than aggressive, because I want to make sure we're making the right decisions at the right times, and I think we did that in this draft.”

Dominik began calculating a week ago when he traded the 13th overall pick in this year's draft and a conditional fourth-round selection next year to the New York Jets for four-time Pro Bowl cornerback Darrelle Revis.

He sat tight on Day 2 of the draft, spending the 43rd pick on Mississippi State cornerback Johnthan Banks and the 73rd pick on North Carolina State quarterback Mike Glennon. As he did, though, the defensive tackles began disappearing.

After four were drafted in the first round, five more were drafted in the second and third. That still left Spence, whom the Bucs had been eyeing all along, but Dominik felt like he had to make a move to keep from losing him.