ISTANBUL—Formula One champion Lewis Hamilton posted the fastest time ahead of title rival Max Verstappen in Friday’s first practice session for the Turkish Grand Prix. This season’s narrow championship leader was .43 seconds ahead of the Red Bull driver in warm conditions. Ferrari’s Charles Leclerc was .48 behind Hamilton in third spot with Hamilton’s Mercedes teammate Valtteri Bottas fourth. There is a second practice later Friday at Istanbul Park. Hamilton leads Verstappen by two points with seven races to go including this one. But the Mercedes driver’s lead could well be lost on Sunday as Hamilton starts the race with a 10-place grid penalty for going over his allocation of three engines for the season. Mercedes fitted a fourth combustion engine on Friday. The Istanbul track proved much more reliable than last year, when it had just been re-laid to host an F1 race for the first time since 2011 …