Rafael Nadal and Roger Federer through to quarterfinals of Qatar Open . - The first time in the history of tennis that a player from one country has won all four Grand Slam titles at once. Nadal taken to three sets by unheralded Slovakian Lukas Lacko . Federer also survives scare to beat his close friend Marco Chiudinelli . Defending champion Nikolay Davydenko also seeking to reach the last eight .
Rafael Nadal and Roger Federer through to quarterfinals of Qatar Open . No . 1 Nadal taken to three sets by unheralded Slovakian Lukas Lacko . Federer also survives scare to beat his close friend Marco Chiudinelli . Defending champion Nikolay Davydenko also seeking to reach the last eight .