@k.arquines - I assume you have already filed 2020 and need to amend...
suggest looking at your transcript at IRS.GOV because I imagine it was reported by the Sports Book so you want to make sure what you report equals or exceeds what they reported on Form 1099-G. These will get added to income on the amendement form.
with respect to losses, they are reported as an itemized deduction and cannot exceed the winnings; if you take the standard deduction, none of the losses are deductible.
