Here's the lowdown on a bunch of fights that are either set, in the works or falling apart:
• Middleweight titlist Gennady Golovkin (26-0, 23 KOs) of Kazakhstan and former title challenger Matthew Macklin (29-4, 20 KOs) of Great Britain have a deal in principle to fight June 29 in the main event of an HBO tripleheader, according to both camps. The fight likely will be finalized in the coming days and could be announced as soon as Saturday at a news conference in New York, where many boxing writers will be covering the Nonito Donaire-Guillermo Rigondeaux junior featherweight unification bout. No site is set yet, but the Foxwoods resort in Mashantucket, Conn., is the front-runner to host.
The co-feature will pit South African super middleweight Thomas Oosthuizen (21-0-1, 13 KOs) against Sacramento's Brandon Gonzalez (17-0, 10 KOs). The fight has been agreed to but isn't yet signed. The opener will feature Cleveland junior middleweight Willie Nelson (20-1-1, 12 KOs), although promoter Lou DiBella and HBO have been arguing over an opponent for days.
• Fresh off his junior lightweight title defense against Diego Magdaleno in Macau, China, last Saturday, Roman "Rocky" Martinez (27-1-2, 16 KOs) is looking toward his next defense. It could come against former featherweight titlist Orlando Salido (39-12-2, 27 KOs) in September in Martinez's native Puerto Rico, according to Salido's manager, Sean Gibbons. Salido, who lost his featherweight belt to Mikey Garcia in January, will fight June 1 in Mexico or June 15 in Puerto Rico before the possible bout with Martinez.
• Light heavyweights Tony Bellew (19-1-1, 12 KOs) of England and Isaac Chilemba (20-1-2, 9 KOs) of South Africa will meet in a rematch May 25 in London on the undercard of the Mikkel Kessler-Carl Froch super middleweight title rematch, according to Chilemba's promoter, Lou DiBella, who said he made a deal with Bellew promoter Eddie Hearn. Once again, Bellew and Chilemba will fight for the right to become champion Chad Dawson's mandatory challenger. Bellew and Chilemba met on March 30 in Bellew's hometown of Liverpool, England, and fought to a draw.
• The third fight between cruiserweight titlist Marco Huck (35-2-1, 25 KOs) and interim titlist Ola Afolabi (19-2-4, 9 KOs) is scheduled for May 11 in Germany, and both fighter camps say their man is training. However, promoter Don King, who doesn't handle either fighter yet won the purse bid for a whopping $1.5 million, still doesn't have a specific site or a television deal, leading both sides to believe the fight won't come off as scheduled. According to the Afolabi camp, the WBO, which is sanctioning the bout, has given King a Wednesday deadline to produce signed contracts for the fight or he will forfeit his right to promote the bout.
• Lightweight Ameth Diaz (31-11, 22 KOs) of Panama will travel to Martin Gethin's hometown of Walsall, England, for a lightweight title eliminator on May 24. Diaz was supposed to face Marvin Quintero in the eliminator on April 5 in Santa Ynez, Calif., but Quintero suffered a broken nose, needed surgery and withdrew from the fight. Since Quintero was unavailable, Gethin (24-3-1, 11 KOs) was the next available contender in the IBF's rankings for the eliminator. The Diaz-Gethin winner will become the mandatory challenger for Miguel Vazquez.
• Featherweight titlist Evgeny Gradovich (16-0, 8 KOs) of Russia will make his first defense against mandatory challenger Mauricio Munoz (26-3, 12 KOs) of Argentina. An April 16 purse bid was canceled after the sides made a deal. Top Rank, Gradovich's promoter, plans to put the fight on in June or July, probably on the undercard of featherweight titlist Mikey Garcia's first defense.
• The promoters for junior lightweights Rances Barthelemy (18-0, 11 KOs), a Miami-based Cuba native, and Thailand's Fahsi Sakkreerin (39-3-1, 21 KOs) reached an agreement for their title elimination bout. Warriors Boxing promoter Leon Margules told ESPN.com that the sides have agreed on the terms and that the fight will be promoted in the United States this summer. The Barthelemy-Sakkreerin winner will become the mandatory challenger for 130-pound titlist Argenis Mendez.