Singapore GP, today 9.45pm ( practice), midnight ( qualifying); tomorrow, race 10.30pm. IndyCars, Monday 10.30am. Lights on as the F1 drivers roar off into the night at the Marina Bay street circuit for the 18th edition of the Singapore Grand Prix. First held in 1966 — and won from 1969 to 1971 by Kiwi Graeme Lawrence — but not from 1974 to 2007, the 5.065km circuit is not without its dramas with the safety car a regular feature. Sebastian Vettel has won four times including a hat- trick from 2011 and fought back from last ( 22nd) on the grid a year ago to finish fifth behind the now- retired Nico Rosberg. Lewis Hamilton, a winner here in 2009 and ’ 14, now leads the F1 championship by three points from Vettel after 13 of the 20 races. In the US, all eyes on the final round of the IndyCar season as they are in Sonoma for the decider. Kiwi Scott Dixon has won three times here ( 2007, 2014 and 2015). His last win also clinched the IRL crown on a countback from Juan Pablo Montoya who cried foul that double points were awarded for the season finale. Josef Newgarden, a four- time winner this season ( but with only nine top 10 finishes) leads Dixon by three points. Dixon has won only once but has 15 top 10 results, including seconds in the last two rounds at Gateway and Watkins Glen.