Floyd Mayweather was in the mood to shop ... so the 50-0 boxing superstar just spent $3.1 MILLION in about 60 minutes, taking about a dozen fancy/expensive pieces of art off the wall at Art Basel in Miami, sources tell TMZ Sports.
Mayweather, along with billionaire Robert Smith and friend Jona Rechnitz, linked up at the Scope Art Show at the famed festival in south Florida ... and the men went on a shopping spree Tuesday night.
It's unclear exactly what Floyd purchased .