Thanks for the headsup, i did not know the person behind the profile, it was just a random friend invitation and shortly i got the same message wich i fully ignored, i did not even look into it like you did, but now that i take a closer look is is indeed a scam, either by purpose or hijacked. i removed and reported him.

Hey, just a warning. Somebody on your friends list just tried to phish me. His name's "Mark" (at least currently), and he has a Lara Croft profile picture. I've reported him. I'm sending this warning to everybody I can on his friends list.

He added me from a common group, and said he needs my help, wants me to vote for his team in a CSGO tournament. Sent me a link to a fake tournament website that wants me to log in with my Steam username and password. I googled the tournament name and there is NOT ONE mention of any such tournament.
The page wants you to log into Steam in order to vote. It shows you a fake Steam login prompt, where it asks you to put your username and password in.