Mexico's Canelo Alvarez has beaten British challenger John Ryder by unanimous decision before 50,000 screaming fans to remain boxing's undisputed super middleweight champion.

Fighting in Mexico for the first since 2011, Alvarez bloodied Ryder's nose and knocked him down, cruising to the victory on Saturday by scores of 120-107 on one card and 118-109 on the other two to improve to 59-2-2.

"I hit him too much in the head and he did not go down," Canelo said. "I've always said it, when they fight me, they give their 100 per cent, it gets complicated because they usually give me the fight of their lives".

Ryder had his four-bout winning streak stopped and is 32-6.

It was Canelo's first fight since he had surgery on his left wrist last March. Before the fight, he said the injury slowed him down in his previous four fights, including his loss to light heavyweight champion Dmitry Bivol a year ago.

After getting a hard-fought victory over Ryder, Canelo has his eyes set on a rematch against the Russian in September.

"I don't want to make any excuses from what happened the last time, it's pointless, but this time my preparation will be different because now (that he's injury free) I can do a different preparation to do all of the things that needs to be done," he said.

In a fight that was touted as the "King is Coming Home", the sold-out crowd at Akron stadium in Guadalajara, just 25 miles away from Juanacatlan, the small town where Canelo grew up. screamed deliriously during the whole fight.

Alvarez and Ryder started a slow-paced fight in the first two rounds, but Canelo connected with a straight right and Ryder started bleeding from the nose after the third round.

The Mexican kept pressing the action in the fourth round, landing body shots, and then sent Ryder to the mat with a right hook to the chin.

Ryder made Canelo uncomfortable in the fifth and landed a few shots on the face of the Mexican, but Alvarez landed another right in the ninth. Ryder stumbled, but rallied and answered with a shot that shook the Mexican.

Ryder, with a bloodied face, closed the fight well in the last two rounds, but was not enough to get the upset.

In the undercard, Julio Cesar "Rey" Martinez (19-2) knocked out Ronal Batista (15-2) to retain the WBC flyweight title.