With the AT&T Williams team finishing their Friday practice in eighth and tenth there was a degree of optimism in the team over their improve performance. Saturday's practice session would show how the team really is. Both Kazuki Nakajima and Nico Rosberg would join a large number of drivers who left the pit lane with the start of the sixty minute session. Kazuki would return to his pit after an installation lap. Nico would join him. After some overnight rain the track was dry for the session. Everyone would return to their pits, with both Ferrari's yet to come out. Fisichella would be the first driver to return to the track.

Fisichella would set a time of 1m:21.255. Team-mate Sutil was next out joined by Toyota's Timo Glock. Fisichella had improved with a 1m:19.243 but Sutil would go significantly faster with a 1m:14.207. Piquet was out on the track. Glock was now fastest with a 1m:13.982. Piquet was third with a time of 1m:18.501. Glock was on a quicker lap finishing with a 1m:13.803. Barrichello, Button, and Heidfeld had left their pits. Trulli was also out on the track. Fisichella had pitted while Piquet was second with a 1m:13.964. The Brazilian would improve with a 1m:13.154 to go fastest. Heidfeld was now second, 1m:13.609. But Barrichello would move ahead of the BMW driver with a 1m:13.290.

Trulli was third, 1m:13.426, while Piquet improved his lap time with a 1m:12.954. Kovalainen, Coulthard, and Kubica had joined the growing number of drivers. Raikkonen was out for the first time with just over forty minutes left. Button was fifth while Kubica went into ninth, 1m:17.866. Both Kazuki and Nico were now out on the track. Hamilton and Alonso were also out as Raikkonen went fastest with a 1m:12.881. Coulthard was now third, 1m:13.058, and Heidfeld fourth. Bourdais would leave his pit as Kovalainen went ahead of Raikkonen with a 1m:12.555. Barrichello was sixth followed by Kubica.

Piquet was now third, 1m:12.954, but this would become fourth as Hamilton went fastest with a 1m:12.278. Massa had joined the session and would move into second with a 1m:12.427. Kovalainen was now third followed by Raikkonen, Vettel, Webber, Bourdais, and Piquet. Nico was down in thirteenth, 1m:13.313, and Kazuki nineteenth, 1m:14.009. Alonso was in twelfth as Nico pitted joined by Hamilton. Kazuki would also pit along with Raikkonen. Alonso would also pit leaving just a handful of drivers on the track, one being Massa. As the second half of the session got underway Massa would pit while Button, Glock, Piquet, Heidfeld, and Kubica returned to the track. Trulli would also leave the pits.

Kovalainen would return to the track with just under twenty five minutes remaining. Alonso would also come out, joined by Nico. Hamilton was also back out on the track as team-mate Kovalainen failed to improve. Raikkonen would also return to the circuit. Hamilton was fastest in sector one but would lose time in sector two and would fail to improve. Kazuki would now join Nico out on the track with nineteen minutes left. Kovalainen would pit after failing to improve on his third. Nico would also pit remaining in thirteenth, 1m:13.313. Massa was back out as Hamilton pitted. Raikkonen would also come in if only for a brief stop. With fifteen minutes left the order was Hamilton from Massa, Kovalainen, Raikkonen, Vettel, Webber, Bourdais, Piquet, Coulthard, and Barrichello in tenth.

Not a lot was changing as Raikkonen pitted along with Kazuki. The track was starting to empty as the drivers returned to their pits in order to get ready for their practice qualifying runs. The first of these would come from Trulli and Button. Trulli would improve to move up to tenth, 1m:13.104. Button would pit remaining in sixteenth. Kubica was back out with under ten minutes remaining. Trulli would pit leaving just Barrichello and Kubica on the track. Rubens would pit while Webber would return to the track while Kubica pitted. Next out was Kovalainen with six minutes left. Hamilton would join him along with Bourdais, Button, and Sutil. Nico and Kazuki were back out for their final runs. Webber would improve to see himself in third, 1m:12.453. Massa was back out as the rest of the field joined him with the final minutes counting down. Kovalainen was now fastest with a 1m:12.225.

But Hamilton went faster with a 1m:12.212. Bourdais was now third, 1m:12.426. Nico would jump up the order and into sixth, 1m:12.625. Kazuki was now tenth, 1m:13.054. Hamilton would pit joined by Webber. Kubica was now tenth, 1m:12.971. Massa had improved with a 1m:12.312 but was still third. Piquet was now sixth, 1m:12.457 ad Trulli pushed Nico down to eighth when he went seventh fastest, 1m:12.457. Raikkonen was down in ninth as the session came to an end. Like the previous Friday session it would be Alonso who would put in a quick lap to move to the top of the times with a 1m:12.141. He had improved from seventeenth. With the end of the session the order was Alonso from Hamilton, Kovalainen, Massa, Vettel, Heidfeld, Bourdais, Webber, Piquet, and Trulli in tenth. Nico had dropped to eleventh, 1m:12.625, while Kazuki was down in fifteenth, 1m:13.054. Raikkonen was in a poor twelfth.

For the AT&T Williams team the session again showed that the FW30 still does not have the performance to allow the team to come away from Brazil with a good result. It would be surprising to see Kazuki make it past Q1 and Nico Q2 in qualifying.

Pos  Driver        Team                      Time     Laps
 1.  Alonso        Renault              (B)  1:12.141 19
 2.  Hamilton      McLaren-Mercedes     (B)  1:12.212 18
 3.  Kovalainen    McLaren-Mercedes     (B)  1:12.225 18
 4.  Massa         Ferrari              (B)  1:12.312 17
 5.  Vettel        Toro Rosso-Ferrari   (B)  1:12.389 19
 6.  Heidfeld      BMW Sauber           (B)  1:12.402 19
 7.  Bourdais      Toro Rosso-Ferrari   (B)  1:12.426 18
 8.  Webber        Red Bull-Renault     (B)  1:12.453 18
 9.  Piquet        Renault              (B)  1:12.457 24
10.  Trulli        Toyota               (B)  1:12.457 19
11.  Rosberg       AT&T Williams-Toyota (B)  1:12.625 16
12.  Raikkonen     Ferrari              (B)  1:12.698 18
13.  Glock         Toyota               (B)  1:12.712 22
14.  Kubica        BMW Sauber           (B)  1:12.971 22
15.  Nakajima      AT&T Williams-Toyota (B)  1:13.054 19
16.  Coulthard     Red Bull-Renault     (B)  1:13.058 22
17.  Barrichello   Honda                (B)  1:13.135 24
18.  Button        Honda                (B)  1:13.278 23
19.  Fisichella    Force India-Ferrari  (B)  1:13.460 22
20.  Sutil         Force India-Ferrari  (B)  1:13.680 22