Erik Sætter-Lassens OL-debut i Antwerpen indbragte ham blandt andet en [[guldmedalje]], som han opnåede som del af holdet i militærriffel, stående på 300 m.<ref name=sr>{{cite web | url = https://www.sports-reference.com/olympics/athletes/sa/erik-saetter-lassen-1.html | title = Erik Sætter-Lassen | publisher = sports-reference.com | access-date = {{dato|16-11-2018}} | archive-date = 18. april 2020 | archive-url = https://web.archive.org/web/20200418003524/https://www.sports-reference.com/olympics/athletes/sa/erik-saetter-lassen-1.html |url-status=dead }}</ref> Derudover blev han nummer fire i den individuelle udgave af samme disciplin med 54 point. Han var sammen med tre andre i omskydning om bronzemedaljen, men sluttede her næstbedst med 51 point. Holdkammeraten [[Lars Jørgen Madsen]] vandt i øvrigt sølvmedalje i denne disciplin.<ref>{{cite web | url = https://www.sports-reference.com/olympics/summer/1920/SHO/mens-military-rifle-standing-300-metres.html | title = Shooting at the 1920 Antwerpen Summer Games: Men's Military Rifle, Standing, 300 metres | publisher = sports-reference.com | access-date = {{dato|16-11-2018}} | archive-date = 17. april 2020 | archive-url = https://web.archive.org/web/20200417193127/https://www.sports-reference.com/olympics/summer/1920/SHO/mens-military-rifle-standing-300-metres.html |url-status=dead }}</ref> Sætter-Lassen var desuden tilmeldt i militærriffel, liggende på 300 m, men her stillede han, i lighed med flere andre danskere, ikke op.<ref>{{cite web | url = https://www.sports-reference.com/olympics/summer/1920/SHO/mens-military-rifle-prone-300-metres.html | title = Shooting at the 1920 Antwerpen Summer Games: Men's Military Rifle, Prone, 300 metres | publisher = sports-reference.com | access-date = {{dato|16-11-2018}} | archive-date = 17. april 2020 | archive-url = https://web.archive.org/web/20200417193126/https://www.sports-reference.com/olympics/summer/1920/SHO/mens-military-rifle-prone-300-metres.html |url-status=dead }}</ref> I 50 m riffel, stående, opnåede han 378 point, samme score som Lars Jørgen Madsen, men scorerne er ikke kendt for alle ud over de tre medaljevindere, så derfor kendes den præcise placering ikke.<ref>{{cite web | url = https://www.sports-reference.com/olympics/summer/1920/SHO/mens-small-bore-rifle-standing-50-metres.html | title = Shooting at the 1920 Antwerpen Summer Games: Men's Small-Bore Rifle, Standing, 50 metres | publisher = sports-reference.com | access-date = {{dato|16-11-2018}} | archive-date = 17. april 2020 | archive-url = https://web.archive.org/web/20200417193131/https://www.sports-reference.com/olympics/summer/1920/SHO/mens-small-bore-rifle-standing-50-metres.html |url-status=dead }}</ref> Endelig stillede han op i holdudgaven af samme disciplin, hvor danskerne blev nummer fire, blot fire point efter nordmændene på tredjepladsen.<ref>{{cite web | url = https://www.sports-reference.com/olympics/summer/1920/SHO/mens-small-bore-rifle-standing-50-metres-team.html | title = Shooting at the 1920 Antwerpen Summer Games: Men's Small-Bore Rifle, Standing, 50 metres, Team | publisher = sports-reference.com | access-date = {{dato|16-11-2018}} | archive-date = 17. april 2020 | archive-url = https://web.archive.org/web/20200417193126/https://www.sports-reference.com/olympics/summer/1920/SHO/mens-small-bore-rifle-standing-50-metres-team.html |url-status=dead }}</ref><ref name=sr />
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