On the opening day of practice for the 23008 Monaco Grand Prix the AT&T Williams team would have mixed results as their drivers finished in varied positions. The results would support Kazuki's view that "I think Monaco will be a big challenge for me."

Nico Rosberg would finish in an encouraging fifth fastest time but team-mate Kazuki Nakajima would struggled finishing the session in fifteenth. Nico was to set his time early in the session.

At the end of the session it would be Kimi Raikkonen who as fastest from the McLaren's of Hamilton and Kovalainen. The session was interrupted by a 16-minute long red flag period to attend to a loose drain cover on the hill out of Sainte Devote. Several drivers would hit the barrier during the session, including Trulli and Heidfeld.

Pos  Driver        Team                      Time     Laps
 1.  Raikkonen     Ferrari              (B)  1:15.948  26
 2.  Hamilton      McLaren-Mercedes     (B)  1:16.216  27
 3.  Kovalainen    McLaren-Mercedes     (B)  1:16.248  28
 4.  Massa         Ferrari              (B)  1:16.292  26
 5.  Rosberg       AT&T Williams-Toyota (B)  1:16.653  27
 6.  Kubica        BMW Sauber           (B)  1:16.834  23
 7.  Alonso        Renault              (B)  1:17.498  25
 8.  Barrichello   Honda                (B)  1:17.511  26
 9.  Webber        Red Bull-Renault     (B)  1:17.798  23
10.  Fisichella    Force India-Ferrari  (B)  1:17.835  26
11.  Glock         Toyota               (B)  1:17.942  26
12.  Button        Honda                (B)  1:18.153  26
13.  Bourdais      Toro Rosso-Ferrari   (B)  1:18.245  30
14.  Heidfeld      BMW Sauber           (B)  1:18.263  13
15.  Nakajima      AT&T Williams-Toyota (B)  1:18.274  28
16.  Trulli        Toyota               (B)  1:18.360  16
17.  Sutil         Force India-Ferrari  (B)  1:18.360  25
18.  Piquet        Renault              (B)  1:18.955  32
19.  Vettel        Toro Rosso-Ferrari   (B)  1:19.176  35
20.  Coulthard     Red Bull-Renault     (B)  No time   3