Mirror Master traps him in a Mirror Construct. That counts as a win right? His constructs/mirrors have held the Flash and Green Lantern imprisoned. So the rogues, take a couple of wins. Etrigan is a chump.
And this helps against a guy who has gone toe to toe with the likes of Lobo and Superman and has uppercutted the latter not only into orbit but to the surface of the moon just outside the JLA Watchtower?
Honestly, I wasn't impressed with Etrigan in his solo series. I have most of the individual issues. All I recall him doing was leaping building in gotham and going up against himself. Other than that, he did fairly well against Wonder Woman in John Bryne's run. I've seen him here and there, but have yet to see him pull impressive feats lke the one's you've mentioned. But, then again he's not a character I follow so my information is very limited.