Morphy? His overall score before going on his European tour was 87 wins, 8 draws and 5 losses. In Europe, he crushed all the reigning top players except Staunton, who avoided a match by various excuses.
Capablanca? During the period from 1917 to 1923 (which included his successful WCC match in 1921) he didn't lose a single tournament game.
Im looking for historic landmarks in chess where a player just dominated.
The only one i can really think of is FIscher winning 6-0 against Taimanov, Then 6-0 against Larsen, Then whooping Petrosian A FORMER WORLD CHAMPION, and then coming back from a 0-2 deficit to beat spassky!