By Miguel Rivera

Mexican superstar Saul "Canelo" Alvarez, like many other experts, believes Mikey Garcia has a very tough assignment in moving up to the welterweight division to challenge IBF world champion Errol Spence.

The contest was officially announced on Tuesday, and takes place on March 16th from AT&T Stadium in Arlington, Texas. The bout will be a Fox Sports Pay-Per-View event.

Garcia, who currently holds the WBC lightweight title at 135-pounds, is moving up by twelve pounds to meet Spence at 147.

Garcia has captured world titles at featherweight, super featherweight, lightweight and junior welterweight. And he wants to captured a world title in a fifth weight division.

He's not fought beyond the limit of 140-pounds, and picked up wins in that division over Adrien Broner and Sergey Lipinets.

Spence is a very big welterweight and regarded as one the most skilled fighters in the sport.

Garcia, while regarded as one of the best pound-for-pound fighters in boxing, is a very big underdog in the contest.

And Canelo believes size might be the big difference in the bout - and he feels Garcia has a very tough task on his hands.

"I think that the two of them are good fighters, but Mikey has little experience fighting at welterweight. I do not know if it's the first [fight for him at 147], but that could be the difference," Canelo told ESPN Deportes.

"Being left-handed, and being at 147 for a long time will be an advantage (for Spence). It will be a good fight, and my support, as always, is with the Mexican."

Canelo, who holds the WBC and WBA middleweight titles, is making his own leap in weight on December 15. He attempts to become a three division world champion when he challenges WBA "regular" super middleweight world champion Rocky Fielding at Madison Square Garden.