Ferrari dominated practice for an inaugural Las Vegas Grand Prix mired in controversy.
Charles Leclerc clocked the quickest time ahead of teammate Carlos Sainz in the latest session in Formula One history, which did not end until 4am local time in Sin City.
The second of two practice sessions bizarrely played out to empty grandstands on an embarrassing opening day for F1 bosses in Vegas.
First practice had to be abandoned after just four laps when Sainz’s car was heavily damaged by a manhole cover, which came loose, and also hit Esteban Ocon’s Alpine.
FP2 was then heavily delayed as the 30 to 40 manhole covers around the track were investigated and repaired where necessary.
In the end, it meant the second session started an hour after spectators, some of whom had paid thousands for their tickets, were vacated from the stands at 1.30am local time “due to logistical circumstances”.
The running on track was almost secondary although tellingly both the cars of Sainz and Ocon were repaired in time to take to the track for the 90-minute session.
The Spaniard, however, was penalised 10 places on the grid for Sunday's race for changing a part of his power unit despite the fact the damage had been done by the loose manhole cover.
Fernando Alonso was next fastest behind the Ferraris while world champion Max Verstappen was a relatively lowly sixth as teams tested out the various tyres and got to grips with the newest circuit on the calendar.
