The Main Events series on NBC Sports is not off to an encouraging start. The company sent out a press release tonight with the news that Eddie Chambers is out of the premiere episode's main event next Saturday night from Philadelphia, having suffered fractured ribs in training.

Chambers (36-2, 18 KO) was to face Sergei Liakhovich (25-4, 16 KO) in the 10-round heavyweight main event next weekend, with junior middleweights Gabriel Rosado and Jesus Soto Karass in the co-feature.

The show is still on, but it's not yet known how it will work out. Rosado vs Soto Karass could potentially be bumped to the main event if an opponent can't be found for Liakhovich, and it's not going to be easy to find anyone good on eight days' notice.

If the heavyweight fight were canceled, the most likely bumps to the televised card would be Joel Julio (37-4, 31 KO) vs Christopher Fernandez (19-14-1, 12 KO); or Philly fighter Ray Robinson (12-2, 5 KO) vs Doel Carrasquillo (16-18-1, 14 KO). Both are eight-round welterweight fights.

This is the second straight scheduled fight that Chambers has pulled out of, following his canceled October 2011 date with Tony Thompson.