Rafael Nadal and Roger Federer through to the quarterfinals of Qatar Open . Also through to the quarterfinals are third seed Jo-Wilfried Tsonga and fifth seed Viktor Troicki . The Spaniard has won all four Grand Slam titles in a row at Wimbledon this year, including his first major title since winning it for Spain last year. Second seed Federer eases past Slovenian Grega Zemlja 6-2 6-3 in Doha . There are also wins for Jo-Wilfried Tsonga and Viktor Troicki on Wednesday .
Rafael Nadal and Roger Federer through to the quarterfinals of Qatar Open . The Spaniard has won all four Grand Slam titles in a row at Wimbledon this year, including his first major title since winning it for Spain last year. Second seed Federer eases past Slovenian Grega Zemlja 6-2 6-3 in Doha . There are also wins for Jo-Wilfried Tsonga and Viktor Troicki on Wednesday .