Ma and Manny are ready to fight Floyd

Billionaire throws out challenge as Pacquiao ramps up talk of rematch

Jack Ma is calling out Floyd Mayweather. And just in case China's wealthiest citizen has any second thoughts, good pal Manny Pacquiao has his back.

In a video posted on Instagram last weekend, eight-division world champion Pacquiao is shown sparring with Ma, billionaire co-founder of Alibaba, at the tycoon's home.