Boris Pavlovich Zaychuk (Russian: Борис Павлович Зайчук; born August 28, 1947 in Kazakhstan) is a male hammer thrower from the Soviet Union. He was the world record holder for nearly one month in 1978, when he became the first man ever to throw 80 meters. During the 2007 World Masters Athletics Championships in Riccione, Italy, Zaitchouk (throwing for Canada) threw 61.96 meters, a new world record in the M60 class. Zaitchouk lives in Ottawa, Ontario, Canada and is still active in throwing and coaching.
| Men's Hammer World Record Holder
July 9, 1978 – August 6, 1978
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