If Floyd Mayweather Jr. was serious about his retirement last month, he walked away from boxing as arguably the greatest fighter of all time.

But as great as Money is, even he couldn't compare to the fight little Leah Still was up against in battling cancer. The five-year-old daughter of NFL free-agent defensive tackle Devon Still defeated her well-documented bout with pediatric cancer earlier this year.

From one champion to another, Mayweather sent Leah an autographed pair of his boxing gloves — one for her and the other to be auctioned off at the annual Still Strong Foundation Gala, as explained in Devon Still's Instagram post Wednesday.

Perhaps Still said it best — undefeated in the ring and undefeated against cancer.

Great gesture by the undefeated champion.

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(Photo: Devon Still via Instagram)