Former IBF welterweight champ Andre Berto stopped Josesito Lopez in the sixth round in the second Premier Boxing Champions show Friday night at Citizens Bank Arena in Ontario, Calif.

Lopez (33-7) went down twice in the final round and couldn’t continue after the second knockdown. Referee Raul Caiz Jr. stopped the fight at 1:03 of the round.

Berto (30-3, 23 KOs) has now won two in a row since back-to-back losses to Robert Guerrero and Jesus Soto Karass in 2012 and 2013.

In another featured bout, Shawn Porter (25-1, 16 KOs), also a former IBF 147-pound titleholder, knocked out late replacement Erick Bone (16-2, 8 KOs) in the fifth round. Bone also went down twice in the final round. The time of the stoppage was 2:30.

And heavyweight contender Chris Arreola (36-4, 31 KOs) outpointed Curtis Harper (12-4, 8 KOs) in an eight-round bout.