Can anybody stop Rafa in Paris?

Roger Federer, whose one French Open title in Paris came in 2009, is a potential semi-final opponent if the Swiss fourth seed can get past Tomas Berdych of the Czech Republic in the third quarter of the draw. Federer opens up against Lukas Lacko of Slovakia and could run early into the talented Ernests Gulbis of Latvia, but his path looks clear enough through to the last eight and a matchup with Berdych.