Ståhl reached his longest throw in the fourth round and gave the thumbs up when he left the ring.
Just Gudzius has eluded Ståhl a couple of times, at the European Championships 2018 and the World Cup 2019 where Ståhl had to settle for the silver.
When Ståhl threw his last throw, mother Taina, father Janne and grandmother Leila cheered on from the stands.
They took in from the toes and the throw was rejected.
Ståhl is Finnish-speaking and had a coffee this morning with his grandmother who lives in Turku, which is Ståhl's second hometown.
The discus in Turku was of the highest class.
Only Christian Ceh was missing from the year's five best pitchers in the world.
Heavy for Lindh
Lovisa Lindh had the best annual best in the 800 meters with 1.59.87 and was well positioned at the lap where she led the cluster, which was ten meters behind the hare, in just over 59 seconds.
Then she stepped on the air on the far long side and ran to the finish line at 2.03.70, a good distance behind the victorious Kenyan Mary Moraa who won the stadium record of 1.59.95, which was also a personal record.
The Olympic qualifying limit is set at 1.59.50.
Tilde Johansson had to settle for 6.29 in the long jump in a light headwind and finished fifth.
Hungarian Anasztazia Nguyen won at 6.51.