Alexander Gustafsson 'shocked' but 'happy' he finished Vladimir Matyushenko

"He just went right to my jab and he went down and I was shocked. I saw him lying there so I continued the ground-and-pound and the judge came, so I got the TKO. I can't' even believe it happened, I trained so hard and he is such a tough guy to finish, I'm too happy. I wanted to strike and wanted to use my reach. I was prepared for two or three rounds of hard battle but it's my day today."