Marciano is the only HEAVYWEIGHT World Boxing Champion to retire undefeated. These boxers also retired undeated:
Name/Record/Era
Horace Notice/16-0-0/1983-1988
*Jimmy Barry/61-0-10/1891-1899
*Jack McAuliffe/49-0-6/1884-1893
*Ricardo Lopez/51-0-1/1985-2001
*Rocky Marciano/49-0-0/1947-1955
Edson Nascimento/47-0-1/1993-2004
Samson "Dutch Boy" Gym/43-0-0/1992-2002
Young Mitchell/35-0-6/1884-1893
*Sven Ottke/34-0-0/1997-2004
Lazlo Papp/27-0-2/1957-1964
*Terry Marsh/26-0-1/1981-1987
Scott Daley/24-0-0/1986-1998
*Pichit Sithbangprachen/24-0-0/1988-2000
Mzukisi Skweyiya/21-0-1/1973-1978
Ike Ibeabuchi/20-0-0/1994-1999
Kirk Daley/19-0-0/1988-1994
Ji Won Kim/16-0-2/1982-1986
Vinny Letizia/16-0-1/1990-1993 *Joe Calzaghe/46-0/ 1993-2008
* = denotes World Champ
I won't include Floyd Mayweather Jr as he is attempting a comeback.
England and Portugal remained undefeated by Napoleon.
Portugal, Spain, and Italy remained Catholic.
Such a match nver happened... Dara singh fought 500 professional fights in his career spanned in almost every continent and remained undefeated in all of them. Bruce lee never belived in such tournaments so a bout between them never happened.
Remained can be both! In the sentence The boy remained sleepy throughout the play, remained is a linking verb. because it connects the subject, the boy to the adj sleepy.
Switzerland
1994, the year of an MLB players' strike. Toronto and Philadelphia remained league champions for an additional year.
Loyalists.
Unfortunately not. Zinoviev remained a single man throughout his life.
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Thailand
Ya
Kentucky, Missouri, Maryland, Delaware.