Alvarez has quickly emerged as arguably Mexico's biggest boxing star.
Despite his powerful body attack and reputation for being a solid, hard-hitter, he is the 11/5 underdog against Mayweather.
Tale of the Tape:
Age: 23, born July 18, 1990.
Birthplace: Jalisco, Mexico, where he still lives.
Record: 42-0-1 (30 KO).
Height: 5ft 9ins.
Weight: (not official weigh-in) 152.
More top news
Labour leader says the UK "should not be afraid of debt or borrowing" as he urges the government to "stop dithering" and start investing.
A fundraising page for a Westminster terror attack victim has been taken over by JustGiving amid fears it was set up by a fraudster.
ITV News rounds up the best pictures of the day as campaigners make a final stand before Theresa May triggers Brexit on Wednesday.