I think on rereading that @Rantcatrat was referring to Sergio always fighting Brits. It's because Barker, and Macklin were good opposition. Beatable but quality guys who would give him a fight. No doubting Martinez cajones. Murray will be just as tough but is not as good a boxer as Barker or Macklin so Sergio may stop him early. GG reminds me of an old school guy, like Armstrong or SRR he has tremendous KO power and a great boxing brain.