The undercard for the junior middleweight title unification bout between WBO champion Xander Zayas and WBA beltholder Abass Baraou on January 31 is rounding out.

In the co-main event, welterweight contender Rohan Polanco (17-0, 10 KOs) will face Christian Gomez (23-6-1, 21 KOs) in a 10-round matchup at the Coliseo Roberto Clemente in San Juan, Puerto Rico, Top Rank announced on Thursday.

In separate 10-rounders, Giovani Santillan (34-1, 18 KOs) will make his 154-pound debut against Courtney Pennington (17-11-3, 7 KOs) and Euri Cedeno (13-0-1, 12 KOs) will continue his middleweight campaign against Etoundi Michel William (16-2, 12 KOs).

“I’m not coming to play on January 31,” said Polanco. “I'm coming to send a strong message to the division. Fighting as the co-main event is a great opportunity that I intend to take advantage of. I represent Dominican boxing. I'm hungry, fearless, and determined to get closer to a world title opportunity.”

The 27-year-old Polanco is The Ring’s No. 5-rated fighter at 147 pounds and a 2020 Dominican Olympian. Polanco fought three times this year, scoring wins against Quinton Randall (UD10), Fabian Maidana (UD10), and Jean Carlos Torres (KO2).

Gomez, a 32-year-old from Mexico, has lost four out of his last five fights in the last three years against the likes of Shakhram Giyasov and Isaac Lucero.