Marquez takes him apart. Fenech's legacy would be awhole lot less if Azumah Nelson didnt have malaria in thier first fight. The Marquez that destroyed Medina was a machine, and I think he'd beat the crap outta Fenech.
Marquez, fairly close. He'd have trouble with Fenech's activity. Fenech would be bewildered in the later rounds as he wound down, having been countered into submission by Marquez's precision shots. 7-4-1 for Marquez. Fenech makes a fist of it.
I think Marquez would have his hands full with Fenech's strength and aggressiveness, but I do think he is presented with too many sweet defensive openings to not win... Marquez by decision, really pouring it on late