Juan Manuel Marquez (born 1973) of Mexico is one of the greatest counter-punchers in boxing history, a four-division world champion whose four-fight series with Manny Pacquiao is among the most celebrated rivalries of the modern era.

Career Highlights

• Professional record: 56 wins, 40 by KO, 7 losses, 1 draw
• World champion at super featherweight, lightweight, junior welterweight, and welterweight
• Legendary KO of Manny Pacquiao in the 6th round of their fourth fight in 2012

Marquez's ability to study opponents and land precise counter shots made him one of the most technically sophisticated fighters of his generation.

Reference:

Wikipedia: Juan Manuel Marquez

https://en.wikipedia.org/wiki/Juan_Manuel_M%C3%A1rquez