Who did Sugar Ray Robinson fight for the middleweight title?

Answer 1

Robinson first won the middleweight title from Jake Lamotta in their 6th fight in Feb 1951.

He won the title a second time in his rematch with Randy Turpin in Sept 1951 (Robinson had 8 fights in between, so was somewhat burned out when he lost to Turpin in their first fight only two months earlier).

He won the title a third time knocking out Carl "Bobo" Olsen Dec '55.

Won it a fourth time in his rematch with Gene Fullmer in May '57 and then won it a 5th time in his rematch with Carmen Basilio in 3rd May 1958. Lost the tile for good in 1960 when Paul Pender became the first man to beat Robinson twice.

boxrec.com

Answer 2

Sugar Ray Robinson did not fight in the heavyweight class.