Mark was fifth on the timesheets this afternoon at Istanbul Park.
Our Australian driver posted a best time of 1:27.149 after 30 laps, while Seb was unable to take part in P2 due to car damage sustained in the morning session.
The drivers are next in action tomorrow at 11am local time for the third and final practice session of the Turkish Grand Prix.
Turkish GP: Friday Second Practice
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Turkish GP: Friday Second Practice