Notes: Estrada flyweight defense set

A few notes from around the boxing world:

• Unified flyweight titlist Juan Francisco Estrada (31-2, 22 KOs) will make his fourth defense when he faces the Philippines’ Froilan Saludar (21-1-1, 13 KOs) on March 28 (beIN Sports Espanol) in Merida, Mexico, Zanfer Promotions announced on Tuesday. Estrada was initially supposed to defend against former titleholder Hernan “Tyson” Marquez (37-5-1, 26 KOs) but, according to Zanfer, Marquez priced himself out of the bout and Saludar accepted the fight.

• Cruiserweight Ola Afolabi (21-3-4, 10 KOs), of England, will travel to Argentina to face former titlist Victor Emilio Ramirez (21-2, 17 KOs) for a vacant interim title on April 10 after the sides made a deal and avoided a purse bid. The IBF made an interim title available because titleholder Yoan Pablo Hernandez (29-1, 14 KOs) is sidelined for an extended period because of a right elbow injury and unable to face Afolabi, his mandatory challenger. Hernandez’s first fight upon his return is mandated to be against the Afolabi-Ramirez winner. If Hernandez is unable to return by Aug. 6, he will be stripped and the Afolabi-Ramirez winner will become the full titleholder. Afolabi, a former interim titlist, is 0-2-1 against Marco Huck in world title bouts.

• Cruiserweight titlist Marco Huck (38-2-1, 26 KO), of Germany, who has been ordered to make his mandatory against Poland’s Krzysztof Glowacki (24-0, 15 KOs), has until Wednesday to make a deal or the WBO will order a purse bid. Minimum bid is $300,000. Huck has made 13 title defenses, tying him with England’s Johnny Nelson for most in cruiserweight division history.

• Cruiserweights Thabiso Mchunu (17-1, 11 KOs), of South Africa, and Ilunga "Junior" Makabu (18-1, 17 KOs), of Congo, will meet May 16 in South Africa, Main Events promoter Kathy Duva told ESPN.com on Tuesday. Duva, who promotes Mchunu, recently won the promotional rights to the bout via a purse bid. The winner of the bout will become the mandatory challenger for world titleholder Grigory Drozd (39-1, 27 KOs) of Russia. Mchunu, 26, has won seven fights in a row. Makabu is unbeaten since getting knocked out in the first round of his 2008 pro debut.