Mikhail Tal
Eleven years after he lost the world championship, he had a record sequence of results. From July 1972 to April 1973, Tal played 86 consecutive games without a loss (47 wins and 39 draws). Between 23 October 1973 and 16 October 1974, he played 95 consecutive games without a loss (46 wins and 49 draws), shattering his previous record. These remained the two longest unbeaten streaks in modern chess history for over three decades, and the longest by a top-flight player until Magnus Carlsen's 111+ game streak in 2019-2020.