UNDEFEATED knockout artist Jaron Ennis may Canelo Alvarez's secret weapon to solving Terence Crawford's switch-hitting style.

Crawford - who glides from the orthodox to southpaw stance like one else before - faces Canelo on Saturday in Las Vegas.

And Canelo has called upon the services of 34-0 former welterweight world champion Ennis as a sparring partner in preparation.

Ennis - like Crawford - switches stances with ease and retired great Shawn Porter believes it is quite possibly Canelo's greatest trump card yet.

"That's excellent work," Porter said on his podcast.

"I always say this, when you're training for a championship fight you need something that is going to raise your level. You never know exactly what it is.

"It could be running in the mountains, it could be a specific s

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