With the next edition of the Summer Olympics less then 6 months and yes nothing is 100% assured but as this current moment who seems to be winning gold guaranteed in Paris.
Swimming
Australia Woman 4x100m
They smashed the world record at world championships last year in Japan. To put in perspective the fastest split form the USA team which came second was only 0.01 faster then the slowest split Australia had. An Australia B team probably wins gold.
Womans 1500m Katie Ledecky
No on is within 15 seconds of her enough said.
Mondo Duplanits
Sydney Mclaughlin
China Team Table Tennis
Extremely likely
USA womans basketball
Australia 4x200m Woman Relay