article_snippet: The Finnish driver and teammate Felipe Massa have consistently been among the fastest performers with both in the top two times through the final four days of testing.
article_snippet: Ferrari's Sebastian Vettel and Sauber's Felipe Nasr both trailed the Williams driver by less than one second .
article_snippet: Ferrari's Sebastian Vettel right behind him at the Barcelona-Catalunya circuit catches up with Nico Rosberg of Mercedes during day four of the final Formula One winter testing .
article_snippet: Ferrari's Sebastian Vettel right behind him at the Barcelona-Catalunya circuit and Sauber's Felipe Nasr were both less than one second slower than Williams driver Valtteri Bottas.
article_snippet: Nico Rosberg of Mercedes may have had a subdued final turn behind Nico Rosberg of Mercedes Mercedes, but the German team has given no indication of slippage after dominating last season when Nico Rosberg of Mercedes was Lewis Hamilton's only challenger for the title.
article_snippet: The Mercedes pair had set the pace on the previous two days, with Nico Rosberg of Mercedes recording the fastest overall lap time in eight days at Montmelo of 1 minute, 22.792 seconds.
article_snippet: Toro Rosso's precocious Max Verstappen, who at 17 is the youngest F1 driver in history, again proved steady behind the wheel with the fourth fastest time.
article_snippet: Toro Rosso's was followed by Red Bull's Daniel Ricciardo.
article_snippet: Sergio Perez in Sergio Perez first turn behind Force India's new car, right in front of Nico Rosberg of Mercedes.
article_snippet: Lotus' Pastor Maldonado was the day's slowest driver, and the only one to end up in the barrier when Lotus' Pastor Maldonado went off course at curve four.
highlights_snippet: Ferrari's Sebastian Vettel finished the day less than one second slower .
  