Mercedes driver Lewis Hamilton of Britain listens to questions during a press conference at the Marina Bay City Circuit ahead of the Singapore Formula One Grand Prix in Singapore, Thursday, Sept. 13, 2018. (AP Photo/Yong Teck Lim)
Members of the Singapore Civil Defense Force prepare dummies for safety drills at the Marina Bay City Circuit ahead of the Singapore Formula One Grand Prix in Singapore, Thursday, Sept. 13, 2018. (AP Photo/Yong Teck Lim)
Mercedes driver Valtteri Bottas, left, of Finland walks the Marina Bay City Circuit track with his personal trainer, Antti Vierula, ahead of the Singapore Formula One Grand Prix in Singapore, Thursday, Sept. 13, 2018. (AP Photo/Yong Teck Lim)
Ferrari driver Sebastian Vettel of Germany prepares in his team garage during first practice at the Marina Bay City Circuit ahead of the Singapore Formula One Grand Prix in Singapore, Sunday, Sept. 14, 2018. (AP Photo/Yong Teck Lim)
Red Bull Racing driver Daniel Ricciardo of Australia sit in his car during first practice at the Marina Bay City Circuit ahead of the Singapore Formula One Grand Prix in Singapore, Sunday, Sept. 14, 2018. (AP Photo/Yong Teck Lim)
Ferrari driver Sebastian Vettel of Germany sits in his car during first practice at the Marina Bay City Circuit ahead of the Singapore Formula One Grand Prix in Singapore, Sunday, Sept. 14, 2018. (AP Photo/Yong Teck Lim)
Mercedes driver Lewis Hamilton of Britain steers his car during second practice at the Marina Bay City Circuit ahead of the Singapore Formula One Grand Prix in Singapore, Friday, Sept. 14, 2018. (AP Photo/Yong Teck Lim)
Williams driver Sergey Sirotkin of Russia steers his car during third practice at the Marina Bay City Circuit ahead of the Singapore Formula One Grand Prix in Singapore, Saturday, Sept. 15, 2018. (AP Photo/Yong Teck Lim)
Ferrari driver Sebastian Vettel of Germany steers his car during third practice at the Marina Bay City Circuit ahead of the Singapore Formula One Grand Prix in Singapore, Saturday, Sept. 15, 2018. (AP Photo/Yong Teck Lim)
Mercedes driver Lewis Hamilton of Britain steers his car during the qualifying round at the Marina Bay City Circuit ahead of the Singapore Formula One Grand Prix in Singapore, Sunday, Sept. 15, 2018. (AP Photo/Yong Teck Lim)
Renault driver Nico Hulkenberg of Germany steers his car during third practice at the Marina Bay City Circuit ahead of the Singapore Formula One Grand Prix in Singapore, Saturday, Sept. 15, 2018. (AP Photo/Yong Teck Lim)
Red Bull Racing driver Daniel Ricciardo of Australia steers his car during the qualifying round at the Marina Bay City Circuit ahead of the Singapore Formula One Grand Prix in Singapore, Sunday, Sept. 15, 2018. (AP Photo/Yong Teck Lim)
Red Bull driver Max Verstappen of the Netherlands speaks during a press conference following the qualifying session at the Marina Bay City Circuit ahead of the Singapore Formula One Grand Prix in Singapore, Saturday, Sept. 15, 2018. (AP Photo/Yong Teck Lim)
Mercedes driver Lewis Hamilton, left, of Britain leads the field at the start of the Formula One Grand Prix of Singapore at Marina Bay Street Circuit in Singapore, Sunday, Sept. 16, 2018. (AP Photo/Yong Teck Lim)
Mercedes driver Lewis Hamilton of Britain steers his car during the Singapore Formula One Grand Prix at the Marina Bay City Circuit in Singapore, Sunday, Sept. 16, 2018. (AP Photo/Yong Teck Lim)
A Ferrari fan watches the action during the Formula One Grand Prix of Singapore at Marina Bay Street Circuit in Singapore, Sunday, Sept. 16, 2018. (AP Photo/Yong Teck Lim)
Red Bull Racing driver Max Verstappen of Netherlands steers his car during the Singapore Formula One Grand Prix at the Marina Bay City Circuit in Singapore, Sunday, Sept. 16, 2018. (AP Photo/Yong Teck Lim)
Mercedes driver Lewis Hamilton of Britain leaps off his car as he celebrates after winning the Singapore Formula One Grand Prix at the Marina Bay City Circuit in Singapore, Sunday, Sept. 16, 2018. (AP Photo/Yong Teck Lim)
Mercedes driver Lewis Hamilton of Britain, center, sprays champagne as he celebrates after winning the Singapore Formula One Grand Prix, next to Ferrari driver Sebastian Vettel of Germany, right, and Red Bull Racing driver Max Verstappen at the Marina Bay City Circuit in Singapore, Sunday, Sept. 16, 2018. (AP Photo/Yong Teck Lim)
Mercedes driver Lewis Hamilton, left, of Britain and Ferrari driver Sebastian Vettel of Germany laugh during a press conference following the Singapore Formula One Grand Prix at the Marina Bay City Circuit in Singapore, Sunday, Sept. 16, 2018. (AP Photo/Yong Teck Lim)
The Mercedes team poses for photos after Lewis Hamilton of Britain, center, wins the Singapore Formula One Grand Prix at the Marina Bay City Circuit in Singapore, Sunday, Sept. 16, 2018. (AP Photo/Yong Teck Lim)
Mercedes driver Lewis Hamilton of Britain sprays champagne as he celebrates with his team after winning the Singapore Formula One Grand Prix at the Marina Bay City Circuit in Singapore, Sunday, Sept. 16, 2018. (AP Photo/Yong Teck Lim)