Ah no he was not, 1- 3 he did some good solid boxing and landed some solid shots. After the third it was apparent that GGG was the stronger fighter, and Rosado few shots where not going to keep GGG from advancing .
So Macklin wasn't credible? Why do people like GGG so much? He is 27-0 with 24 KO's, he has destroyed some pretty tough customers, and was an incredible amateur. He seems to be a pretty complete fighter. Stevens isn't bad, but we already know he can lose.