The Romance of the Chess World Championship Match and the World Champions that won them:
There can only be Two.
The Champion to hold the Title he beat all the masters for.
The Challenger on quest for same Title of yore.
Robert James Fischer
Bobby Fischer in general had good scores against his fellow World Champions. Only Tal had a plus score against him; while Euwe and Botvinnik had tied scores. Fischer had plus scores against Smyslov, Petrosian, and Spassky.
The most peculiar of all World Champions outside of chess for his adamant views on his own USA government, Russians, and Jews, Fischer also left a taint to his otherwise sterling competitive record by defaulting two matches that, after all is said and done, he probably doubted his ability to win - the unfinished 1961 Reshevsky Match and the would-be 1975 World Championship Match with Karpov - giving rise to more or less permanent notions among some chess pundits that he got scared and ran away.
Over the chessboard Fischer developed a clear flowing accurate style reminiscent of his favorite players Morphy and Capablanca, that could be relatively easy to study and understand but so extremely difficult to face that Fischer's opponents were often said to be hopelessly intimidated even at the start of each game.
In his prime in 1970 to 1972, Fischer totally dominated the chessworld as no other player ever has, before or since. His incredible 19 straight victories in the Interzonals - Candidates matches of 1970 to 1971, including a wipe-out of two Candidates matches (Taimanov 6 - 0 and Larsen 6 - 0) was such a massive crush of the world's top players that it should have been impossible, save that it actually happened. I believe that this 1969 to 1972 version of Fischer (and the Capablanca of 1916 to 1924) was the strongest human player ever to exist in chess history.
Robert James Fischer tied Max Euwe 1 to 1, with 1 draw
Robert James Fischer tied Mikhail Botvinnik 0 to 0, with 1 draw
Robert James Fischer beat Vasily Smyslov 3 to 1, with 5 draws
Mikhail Tal beat Robert James Fischer 4 to 2, with 5 draws
Fischer beat Tigran Vartanovich Petrosian 8 to 4, with 15 draws
Robert James Fischer beat Boris Spassky 17 to 11, with 28 draws