Least likely is women's 800m. Shaving off almost 2 seconds in the 800m is just not possible for the current competitors. Mu and Hodgkinsen just do not compete enough, so the only chances to break it are when Nike steps in and forces them to run a race or Olympics / Outdoor WC. But most of those races they are more concerned with winning than WR.
Most likely: Mondo and Ryan Crouser could possibly break their own WRs again
Possibly some records in the distance events, depending on how many WR attempts happen in the Diamond League circuit
Shericka could possibly break FloJo's 200 record if she runs in ideal conditions with a strong tailwind.
There are a lot of fast women in the sprint hurdles, so under ideal conditions someone could break that too.
USA could break the women's 4x1 record if they get perfect handoffs at the Olympics. Jamaica too if they Shericka, Elaine and Shelly-Ann are all in 10.6 form.
Mixed 4x4 could be broken too but no one really cares about that event.
Any other record I don't see being broken this year tbh, unless someone suprises with a freak performance like Alekna last week.
Least likely is women's 800m. Shaving off almost 2 seconds in the 800m is just not possible for the current competitors. Mu and Hodgkinsen just do not compete enough, so the only chances to break it are when Nike steps in and forces them to run a race or Olympics / Outdoor WC. But most of those races they are more concerned with winning than WR.
That shouldn't even count as the world record. The doping was so obvious you'd think Kratochvílová was a man. Same with Koch's 47.60