[3] Kosugi's biggest accomplishment came in April 1985, when he defeated Yamada to win the very first Young Lion Cup.
[5] His last recorded match as an active wrestler occurred on March 18, teaming with Don Arakawa, losing to Hiro Saito and Norio Honaga.
After retiring from the ring, he returned to his hometown to run a liquor store, owned by his wife's family.
On September 26, 2010, after over 22 years since his last match, Kosugi made a surprise return in a battle royal, held by Tatsumi Fujinami's Dradition promotion.
On September 18, 2019, at a Pro Wrestling Zero1 in Sado, he handed a bouquet to the soon retiring Jushin Thunder Liger.