Jenson Button put Brawn GP back at the front of the pack at Jerez on Tuesday when the Brit achieved the exceptional and broke into the 1:17s.
Button, who replaced team-mate Rubens Barrichello at midday on Monday, was back in the cockpit of his BGP001 on Tuesday morning, with the early focus being on qualifying laps.
It wasn't long into the morning's session before the Brit, covering qualifying-style runs, broke into the 1:17s - the first driver to do so this week. However, he didn't stop there and went on to lower the benchmark time to a rather impressive 1:17.844.
Despite track conditions improving as the day wore on, Button wasn't able to beat his morning time as Brawn GP turned their attention to race simulations in the afternoon with Button covering a total of 114 laps.
Second place went to Nico Rosberg, who like Button also focused on qualifying runs during the morning session. The Williams driver, though, had his running cut short when he crashed his FW31 into the barriers two hours before the close of play.
Rosberg's accident brought the day's one and only red flag, with the session halted for roughly seven minutes while the marshals cleared away his car.
Nelson Piquet Jr, who was in action for Renault replacing team-mate Fernando Alonso, set the third best time and will be pleased to note that he was well within a second of Button's P1 time.
In fact only one driver present at Jerez finished over a second off Button's time and that was reigning World Champion Lewis Hamilton. Another disappointing day for McLaren saw the Brit 1.2s down at the close of the play.
01. Button Brawn 1:17.844 114 laps
02. Rosberg Williams 1:18.071 66 laps
03. Piquet Renault 1:18.382 128 laps
04. Hamilton McLaren 1:19.121 118 laps
Source : Planet F1