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A general view of the circuit during practice ahead of the Singapore Formula One Grand Prix at Marina Bay Street Circuit on September 19, 2014 in Singapore, Singapore. (Photo by Lars Baron/Getty Images) ( 455705964 )

Member of the Infiniti Red Bull Racing run tires out of the garage to the pit lane as they take part in a pit stop practice session during previews ahead of the Singapore Formula One Grand Prix at Marina Bay Street Circuit on September 18, 2014 in Singapore, Singapore. (Photo by Mark Thompson/Getty Images) ( 455695676 )

Members of the Infiniti Red Bull Racing team take part in a pit stop practice session during previews ahead of the Singapore Formula One Grand Prix at Marina Bay Street Circuit on September 18, 2014 in Singapore, Singapore. (Photo by Dan Istitene/Getty Images) ( 455695782 )

Red Bull Racing French driver Sebastian Vettel takes off during the second practice session of the Formula One Singapore Grand Prix at the Marina Bay Street circuit on September 19, 2014. The Singapore Grand Prix will take place on September 21. ROMEO GACAD/AFP/Getty Images ( 533568722 )

Sebastian Vettel of Germany and Infiniti Red Bull Racing drives during practice ahead of the Singapore Formula One Grand Prix at Marina Bay Street Circuit on September 19, 2014 in Singapore, Singapore. (Photo by Lars Baron/Getty Images) ( 455723088 )

Vettel of Germany and Infiniti Red Bull Racing sits in his car in the garage for practice ahead of the Singapore Formula One Grand Prix at Marina Bay Street Circuit on September 19, 2014 in Singapore, Singapore. (Photo by Mark Thompson/Getty Images) ( 455705534 )

Red Bull Racing driver Daniel Ricciardo of Australia returns to the pit after the first practice session of the Formula One Singapore Grand Prix at the Marina Bay Street circuit on September 19, 2014. The Singapore Grand Prix will take place on September 21. KITAMURATOSHIFUMI KITAMURA/AFP/Getty Images ( 533560002 )

McLaren driver Kevin Magnussen of Denmark steers his car during the first practice session for the Singapore Formula One Grand Prix on the Marina Bay City Circuit in Singapore, Friday, Sept. 19, 2014. In the background, the Singapore financial skyline is seen. (AP Photo/Ng Han Guan) ( Singapore F1 GP Auto Racing )

Kimi Raikkonen of Finland and Ferrari drives during practice ahead of the Singapore Formula One Grand Prix at Marina Bay Street Circuit on September 19, 2014 in Singapore, Singapore. (Photo by Mark Thompson/Getty Images) ( 455722230 )

Mercedes driver Lewis Hamilton of Britain drives his car during the second practice session of the Formula One Singapore Grand Prix at the Marina Bay Street circuit on September 19, 2014. The Singapore Grand Prix will take place on September 21. TOSHIFUMI KITAMURA/AFP/Getty Images ( 533568008 )

Lotus driver Pastor Maldonado of Venezuela prepares for the first practice session for the Singapore Formula One Grand Prix on the Marina Bay City Circuit in Singapore, Friday, Sept. 19, 2014. Seen in the background is the financial skyline. (AP Photo/Ng Han Guan) ( Singapore F1 GP Auto Racing )

Ferrari's Spanish driver Fernando Alonso steers his car during the second practice session of the Formula One Singapore Grand Prix at the Marina Bay Street circuit on September 19, 2014. The Singapore Grand Prix will take place on September 21. MOHD RASFAN/AFP/Getty Images ( 533569490 )

McLaren Mercedes' Danish driver Kevin Magnussen steers his car during the second practice session of the Formula One Singapore Grand Prix at the Marina Bay Street circuit on September 19, 2014. The Singapore Grand Prix will take place on September 21. MOHD RASFAN/AFP/Getty Images ( 533568639 )

Lotus driver Pastor Maldonado of Venezuela leaves his car after crashing during the second practice session of the Formula One Singapore Grand Prix night race on September 19, 2014. MOHD RASFAN/AFP/Getty Images ( 533567309 )

Track Marshals recover the crashed car belonging to Lotus driver Pastor Maldonado of Venezuela during the second practice session of the Formula One Singapore Grand Prix night race on September 19, 2014.MOHD RASFAN/AFP/Getty Images ( 533567000 )

Red Bull Racing team german driver Sebastian Vettel (R) waits in the control station prior to take off in the second practice session of the Formula One Singapore Grand Prix at the Marina Bay Street circuit on September 19, 2014. The Singapore Grand Prix will take place on September 21. ROMEO GACAD/AFP/Getty Images ( 533569465 )

Mercedes driver Lewis Hamilton of Britain prepares for the first practice session for the Singapore Formula One Grand Prix on the Marina Bay City Circuit in Singapore, Friday, Sept. 19, 2014. (AP Photo/Wong Maye-E) ( Singapore F1 GP Auto Racing )

Mechanics from team Force India prepare for a tire change during the second practice session for the Singapore Formula One Grand Prix on the Marina Bay City Circuit in Singapore, Saturday, Sept. 20, 2014. (AP Photo/Wong Maye-E) ( Singapore F1 GP Auto Racing )

Lotus driver Pastor Maldonado of Venezuela steers his car during the first practice session for the Singapore Formula One Grand Prix on the Marina Bay City Circuit in Singapore, Friday, Sept. 19, 2014. (AP Photo/Wong Maye-E) ( Singapore F1 GP Auto Racing )