Jerwin Ancajas's title defense against Jonas Sultan likely on April 28 in Philadelphia

Jerwin Ancajas is ready to rumble again (2:01)

"The City of Brotherly Love" awaits Jerwin Ancajas for his mandatory IBF super flyweight title defense on April 28 against fellow Pinoy fighter, Jonas Sultan. (2:01)

MAGALLANES, Cavite -- Boxing fans may have to wait a little longer to see International Boxing Federation super flyweight champion Jerwin Ancajas back in action.

According to Ancajas's coach and manager Joven Jimenez, instead of being on the undercard of the Terrence Crawford-Jeff Horn WBO welterweight title fight on April 14 in Las Vegas, Top Rank, which signed Ancajas to a three-fight deal for 2018, is now looking at April 28 in Philadelphia as the next possible date and place for Jerwin's fifth title defense against mandatory challenger Jonas Sultan of Cebu.

And this time, Ancajas might be the main event.

"It's 90 percent sure it will be in Philadelphia," Jimenez told ESPN5 in Filipino. "(The) Las Vegas (fight) would have been pay-per-view, and it would have been hard to sell because Jerwin will be fighting a fellow Filipino. We're now looking at Philadelphia where he could be the main event."

Ancajas (29-1-1, 20 KOs) sees the change of schedule as a blessing to have more preparation for the fight.

"The change favors us because the first schedule was sooner and gave us little time to prepare. This time we can really program our training."

Team Ancajas is wasting no time preparing for Sultan whom they all respect and admire.

"He (Sultan) had a good strategy against (John Riel) Casimero. At first he couldn't get in, he was just waiting for his chance and doing counterpunching," Ancajas said about Sultan's upset win over former two-division titlist Casimero in September last year which earned him the no. 1 ranking and status as mandatory challenger. "in the late rounds he was really on the attack. He really thinks inside the ring."

"Jonas is very good," Jimenez added. "He's a very good boxer and he has natural talent. Now he's even become stronger. We noticed his punching has become stronger. So we have to prepare for him."

Sultan (14-3, 9 KOs) is promoted by the famed ALA Boxing group in Cebu and is on a five-match winning streak. He is currently the IBF intercontinental super flyweight champion.

Once finalized, the Ancajas-Sultan title fight will be the first between two Filipinos since 1925, when Pancho Villa beat Clever Sencio by unanimous decision in Manila for the world flyweight crown.

ESPN'5s Sid Ventura and JC Ansis contributed to this report.