Apinis threw 20.83 meters, pulling out his best result of the season just when it was required.
Aigaram Apinim ZELTS diska mešanā! https://t.co/WfipCSdXxA pic.twitter.com/X1FmjFZHpq
— LPKomiteja (@LPKomiteja) September 8, 2016
This is the fifth Paralympics for Apinis, who has won four golds, two silvers and two bronze medals in the discus and shot-put disciplines over the course of his career.
His performance saw congratulations pouring in from officials and was particularly welcome given Latvia's failure to win a single medal in the earlier Rio Olympic Games.
The well-wishers were led by President Raimonds Vejonis who described it as a "beautiful victory".
Latvija patiesi lepojas ar Aigara Apiņa zelta panākumu #Rio2016Paralympics! Skaista uzvara!
— Valsts prezidents (@Rigas_pils) September 8, 2016