Kell Brook may have suffered his first professional defeat in his war with Gennady Golovkin on Saturday ( 10 September ) .
Kell Brook left the O2 Arena with a reputation well and truly enhanced .
Kell Brook may have suffered his first professional defeat in his war with Gennady Golovkin on Saturday ( 10 September ) , but he left the O2 Arena with a reputation well and truly enhanced .