Matt Mitrione and Gabriel Gonzaga have been signed to UFC on FOX 13, giving the December event two heavyweight bouts to date.

Set for December 13 from Phoenix and the U.S. Airways Center, the main card airs on FOX. No main event has been confirmed, but the card will feature Alistair Overeem-Stefan Struve.

Mitrione (8-3) has spent his entire pro career in the UFC after appearing on The Ultimate Fighter. He has won two straight, including a 41-second knockout of Derrick Lewis recently.

Gonzaga (16-8) is in another go-round with the promotion after previously working his way into a contender role. He has won five of seven, but did fall to Stipe Miocic at UFC on FOX 10.

Below is the current lineup for the night:

Heavyweight: Stefan Struve vs. Alistair Overeem

Lightweight: Jamie Varner vs. Drew Dober

Middleweight: Derek Brunson vs. Ed Herman

Lightweight: Joe Ellenberger vs. Bryan Barberena

Heavyweight: Gabriel Gonzaga vs. Matt Mitrione