As sports science and medicine reach new heights, it's not uncommon to see athletes excel well beyond their best years, sometimes facing opponents young enough to be their children. That would seem to be exactly the case for Saturday's Canelo Alvarez-Shane Mosley junior middleweight title bout in Las Vegas -- except that the age disparity between the 21-year-old Alvarez (39-0-1, 29 KOs) and the 40-year-old Shane Mosley (46-7-1, 39 KOs) isn't nearly so dramatic when you consider that Canelo turned pro at age 15 and he already has 40 fights.
But quantity and quality, whether they be measured in years or experience, are separate issues. Alvarez has faced several solid contenders with winning records in the past few years, but Mosley's competition -- most of which he has dominated over the course of his career -- comprises a veritable laundry list of great fighters of his era. The former three-division champion remains the only man to have notched two defeats against Oscar De La Hoya, one of a crowd of former and future champions Mosley has beaten.
With Canelo's 154-pound belt and quite possibly Mosley's future in the sport at risk, here are five keys to victory for Alvarez on Saturday:
The OH factor
The 'ol 4-5 is the new 1-2
Bring on the D
Eye of the tiger
Diego Morilla is a contributor to ESPNdeportes.com.