A few notes from around the boxing world:

• Top Rank’s Bob Arum, who hopes to match featherweight titleholder Vasyl Lomachenko and Nicholas Walters in a unification fight later this year, after each has one more fight, told ESPN.com he has talked to HBO about the possibility of Lomachenko making a defense on the undercard of fellow Ukrainian and heavyweight champion Wladimir Klitschko’s defense against Bryant Jennings on April 25 at New York’s Madison Square Garden. Arum said Walters could land on the HBO undercard of lightweight champion Terence Crawford’s next fight, which likely will be in April or May (and will probably mark Crawford’s move up to junior welterweight).

• Although Top Rank controls featherweight titleholder Lomachenko, Walters and Evgeny Gradovich, adviser Al Haymon handles former titlist Abner Mares and contender Gary Russell, who lost to Lomachenko a decision for a vacant belt last year. Mares is slated to fight an opponent to be determined March 7 on the Keith Thurman-Robert Guerrero undercard at the MGM Grand in Las Vegas. Haymon is also trying to put together a fight in which Russell would challenge titlist Jhonny Gonzalez on March 28 on his new “Premier Boxing Champions” series with the idea that Mares, should he win March 7, would face the winner of the proposed Gonzalez-Russell fight in June.

• The reason you didn’t see Brian Kenny hosting Showtime’s Deontay Wilder-Bermane Stiverne card two weeks ago is his contract with the network expired at the end of 2014. According to Showtime, Kenny was offered a new contract but is “weighing his options.” Kenny, according to broadcast industry sources, might become involved in broadcasting Haymon’s “Premier Boxing Champions” series, which will air on NBC, NBC Sports Net and Spike TV beginning in March with other broadcast outlets also likely to be added. Industry sources said Haymon is planning similar time buys for the cards on CBS Sports Net and BET to put on fights involving his vast stable of more than 150 fighters.

• British promoter Frank Warren announced he will not renew his management and promotional contracts with British and Commonwealth welterweight champion Frankie Gavin (21-1, 13 KOs), the 29-year-old former world amateur champion. Warren signed Gavin, one of boxing’s top prospects when he entered the pro ranks, in 2008 and has promoted him throughout his career. No reason was given for the decision.