Earlier today, Sycuan Ringside Promotions informed the IBF that Julio Diaz is voluntarily vacating his lightweight championship for the opportunity to challenge WBC lightweight champion Jose Luis Castillo on Showtime Championship Boxing on March 5. Diaz was originally scheduled to face Leavander Johnson on February 11, but the opportunity to face Castillo was too great for Diaz to turn down. Johnson will now fight for the vacant title. The IBF's leading available contender is Steffano Zoff, but Boxingtalk.com also understands that Acelino Freitas-Leavander Johnson is a possibility as well! Remember Where You Heard It First! (5:58 PM ET)