Yeah, Mayweather's win streak is probably the current best. It'd be indisputable if he fought Pacquiao, but I think Floyd would've beat him anyway.Floyd Mayweather 45-0 for greatest active streak by someone still competing if you want to limit it to perfect records. I think the Spurs and Red Wing streaks are for more impressive even with the Spurs having 404 losses since the start of the streak including playoffs. 15 years of consistent excellence > winning ~10 truly competitive fights and not making a big mistake against ~35 inferior boxers.