He started on PAF, an online poker room belonging to the Ongame Network, where he made several deposits of €30 each and began playing $0.25/$0.50 and $0.50/$1.00 games.

[citation needed] Kelopuro made a major impact on the cash game scene in 2007, moving up to high-stakes no-limit Texas hold 'em and pot-limit Omaha hold 'em cash games at Full Tilt Poker, playing on limits up to $500/$1,000.

He was involved in some of the biggest poker hands[3] at the time, experiencing daily swings up to a million dollars.

[7][8] In August 2019, Sami Kelopuro won $1.3 Million during 8 hours in a PLO Omaha heads-up game against an unknown player.

He is one of the biggest multi table tournament winners in online poker history, cashing for $23.3 million over a number of sites.