I have some people asking me this yesterday and it looks like a valid question. Because there are so many pros now I will only focus on the more popular ones.
Let’s start with FulllinePoker. They brag to have the most pro online players, and this might be true with people like the following players:
Phil Ivey, Gus Hanson, Mike Matusow, Allen Cunningham, Erik Seidel, Andy Bloch, Howard Lederer, Phil Gordon, John Jenanda, David Gray, Jennifer Harman, Erick Lindgren, and Chris ‘Jesus’ Ferguson just to mention some (there are still many again). A list of players who are quite impressive if you ask me.
But pro play on many other sites too. Daniel Negreanu poker child recently started his own site in fullcontactpoker, and he could be found playing there from time to time.
Doyle Brunson also separated from the rest of the package and made his own site in Doylesroom.com, the site he, Chip Reese and Todd Brunson all can be found on.
Other pro like Phil Hellmuth, Barry Greenstein, Hoyt Corkins, Freddy Deeb and Greg Raymer have been known to play in PokerStars, but I dominoqq am sure they play more than just there. Annie Duke, Layne Flack, Antonio Esfandari, Scotty Nguyen and even Phil Ivey (against the Fulltilt policy?) It has been seen playing a high boundary table on the main betting.
If you watch a number of poker on TV, you can usually see pro advertisements for their site with some clothes, whether it’s a hat or button down.
But as soon as possible, the best bet if you want to take action against pro players must be tilted full. However, if you try to avoid pro pro, you are most likely to stick to smaller sites that are not supported (or owned) by Pro players.