According to Steve Kim, the GGG-Rosado fight was by far the most viewed on last weeks HBO card, with 813,000 viewers.
Martinez -Burgos had 520,000 viewers
Garcia-Salido had 780,000.
From Steve Kim's article:
"I talked late into the night at Jimmy’s Corner with an employee of Madison Square Garden who told me they absolutely consider themselves in the Golovkin business. Judging by the crowd, there were a good number of Kazak’s out in the audience with their flags. Yes, like the Klitschkos (who have done significant business in the Big Apple in the past), it does look like there is something to be had here. He has a fan-friendly style and a constituency in this region.
Also selling a good amount of tickets was undercard fighter Sean Monaghan who, despite limited talent, is a guy who brings his share of people through the turnstiles. Go to any card in New York City with this guy (big or small) and he brings a sizable clan with him. In talking to a few fans who went to the Theater on Saturday night, they noted that partisans of both Monaghan and Golovkin left after their guys finished fighting, not caring too much about what fights followed."
Still not really known in the US?