Only 4 teams have lost by more than 300 runs so far. South Africa, Netherlands, Sri Lanka and USA. Sri Lanka has lost by 200+ runs twice. And both times they lost against India. But yesterday South Africa broke all records. They lost by a huge margin of 342 runs. And I don't think any other team will be able to break this shameful record.
Never expecting to see South Africa at the top of this list. It is a big shame for them. SA could have reduced the losing margin a little if Bavuma was fit to bat. Still, getting all out in less than 100 runs is something unexpected from South Africa while the target is above 400 runs. SA batsmen have failed miserably in the last ODI match. I also think that this shameful record won't be broken by any other team.