The Montreal fighter pounded Fonfara with left-hand blows before Fonfara’s corner waved to referee Michael Griffin to stop the beating.
“There was no need to continue,” Fonfara’s trainer, Virgil Hunter said. “He was hurt in the first round.”
Stevenson (29-1) defended the title he won in 2013 and beat Fonfara (29-5) for the second time, this time much more easily than his win by unanimous decision in 2014 that saw both fighters hit the canvas.
“I was in focus for this fight and you saw what happened,” Stevenson said. “My hands were moving very good and you saw what happened. I know he’s very dangerous – he’s a good fighter. When I had the chance to catch him I caught him. I took my time and I finished the job.”
This time, the southpaw Stevenson came out firing lefts from the start. He put Fonfara down midway through the first and ended the round raining blows on the right-hander.
The onslaught continued to start the second with at least five clean lefts landing before the bout was stopped.
“He got me in the second round with a punch and it changed everything. After that I was not the same. He showed me tonight he’s the champ. I need to rest and come back harder,” Fonfara said. “Virgil wants to protect me. Everyone knows Stevenson is a great fighter. He has a hard left hand and he could have hurt me more. This rematch didn’t go like I want.”
It definitely went the way the 39-year-old Stevenson envisioned.
“I’m the greatest at 175 — the champ, baby. I’m the king,” Stevenson said. “I don’t have to call anybody. Whoever (manager) Al Haymon puts in front of me, I’m ready.
In the co main event, the taller, sharper Eleider Alvarez out-boxed the former WBC light heavyweight champion , Jean Pascal to win a majority decision in their 12-round, 175-pound bout at Bell Centre in Montreal. One judge, Richard DeCarufel, scored the fight even (114-114), but judges Rodolfo Ramirez (117-111) and Jack Woodburn (116-112) favored Alvarez’s accuracy and activity during much of the fight.
The Colombian-born Alvarez, a Montreal resident, improved to 23-0. The 34-year-old Pascal, of Laval, Quebec, fell to 31-5-1 (18 KOs, 1 NC) and 2-3 in his past five fights.