Canelo Alvarez is 5'8". His opponent Callum Smith is 6'3".
BIG DIFFERENCE!
So, to prepare for their main event showdown at the Alamodome in San Antonio on Saturday night ... Canelo packed his training camp with super tall sparring partners!!
It's all captured on the DAZN docu-series "40 Days: Canelo vs. Smith" -- which chronicles both fighters as they get ready for the Dec. 19th event, which is available on the streaming platform in 200 countries and territories.
Fun Fact: soccer superstar Harry Kane teamed up with DAZN to executive produce the series.