Probably depends on who is making the statement.



Ring rates him #1...then for some reason they then state-even though his prime was at WW.
https://www.ringtv.com/516348-rankin...ght-champions/
However from an oldschool perspective: The late Nate Fleisher of Ring Magazine rated Ketchell the best middle weight of all time.

ESPN rates SRR #1 -but that is GOAT not as a MW alone- as they state: 1. Sugar Ray Robinson

Welterweight, middleweight
Ring career: 1940-65 Record: 175-19-6-2 (109 KOs)

http://www.espn.com/sports/boxing/gr...ge=greatest110



https://www.talksports24x7.com/2019/...0to%20overcome.

This list states Hagler is#1.




https://www.boxingscene.com/top-25-m...top-ten--24472
Ranks him #2 MW.
They state: Robinson stands out as the greatest Welterweight of all time and could well be argued as number one here.



Why He’s Here: However, a certain degree of inconsistency must also be taken to account. Robinson was virtually unbeatable at Welterweight and against Welterweights; it wasn’t the case at Middleweight,


Then they respond to the this thread's question:While he had to lose it four times, the fact that Robinson could win the title five times is awesome stuff and spoke to the incredible will to win he had.


They ranked Greb #1.


I place him #1 WW #1 P4P. Never really thought to rank him #1 at MW. This thread made me remember there are those who do!