Since Federer declined in 2008 and forward he has defeated Del Potro x2, Berdych and Tsonga in Australian open.
Who do you want him to play who can beat him before SF?
Exactly, even guys like Simon, Del Potro, Berdych, and Tsonga who can give him a hard time/beat him before the SFs of a GS haven't been able to beat Rogie at the AO (2005 SF loss to Safin, 2008 SF loss to Djokovic, 2009 F loss to Rafa, 2011 SF loss to Djokovic, and 2012 SF loss to Rafa). I don't see anyone beating him before the SF. My question too is, come AO time based on seedings will the SFs be Rogie/Rafa and Djokovic/Mugray or Rogie/Mugray and Djokovic/Rafa (unless Rogie and Djokovic aren't 1 and 2 by the 2013 AO, though I think they would be, but in the case that they are not then it could be Rogie/Djokovic and Rafa/Mugray again, lol). Anyway I think it's a very valid post because it's the only remaining grand slam where Rogie hasn't lost before the SF since 2003, it's been 9 consecutive years of SF or better (4 SFs, 1 F, and 4 titles: 2004, 2006, 2007, and 2010).