Manama, Bahrain:  Germany's Nico Rosberg registered the fastest time in his Mercedes in Saturday's pre-season testing session at Bahrain's Sakhir circuit as world champions Red Bull endured another frustrating day.Rosberg managed to go a second faster than his teammate Lewis Hamilton a day earlier, outpacing Jenson Button's Mclaren and Kimi Raikkonen in a Ferrari at the end of an encouraging week for Mercedes."This morning we were able to try some qualifying practice runs which felt good, meaning I could attack the lap a bit as I found a good balance," Rosberg told the sport's official website, www.F1.com.After a late crash which brought his day to a premature end Raikkonen,...
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