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John Haack is an American powerlifter. He is the current world record holder in the raw (without knee wraps) 82.5 kilogram weight class. He set the current world record of 907.5 kg on August 3, 2019 at the age of 26 at the Tribute powerlifting meet in San Antonio, Texas. For this total, he squatted 312.5 kg, bench pressed 232.5 kg, and deadlifted 362.5 kg. This total beat his own previous records of 890 kg (set April 20, 2019) and 875 kg (set December 15, 2018). The previous record holder in this weight class was Maliek Derstine, with a total of 862.5 kg on January 23, 2016.

Haack is also the world record holder in the raw (without knee wraps) 90 kilogram weight class. He set the world record of 932.5 kg (327.5 kg squat, 237.5 kg bench press, 367.5 kg deadlift) on January 19, 2020, beating the previous record of 922.5 kg set by Jesse Norris on November 7, 2015.

Before switching to the USPA (United States powerlifting association), he was the 2016 International Powerlifting Federation (the major drug-tested powerlifting organization worldwide) world champion in the classic (raw without wraps) 83 kg weight class, beating multiple IPF world champion Brett Gibbs with an IPF world record total of 813 kg (298 kg squat, 200 kg bench, 315 kg deadlift). This IPF world record has since been beaten by Brett Gibbs in the 2018 IPF world championships with a total of 830.5 kg and by Russel Orhii with a total of 833 kg in the 2019 IPF world championships.