Carlos Sainz and Charles Leclerc powered their Ferraris to a one-two in second practice Friday for the Singapore Grand Prix, while runaway championship leader Max Verstappen and Red Bull struggled on Formula One’s return to Asia.

The Dutchman celebrated his 25th birthday Friday with a cake in the Red Bull team hospitality before the first session, then spent most of the second in the garage with mechanics working on his front suspension.

Verstappen, who can retain his Formula One world championship with a race win on Sunday if other results go his way, did emerge late in the hour-long session for one qualifying simulation lap.

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