Mercedes team principal Toto Wolff says the Silver Arrows have cause for concern after seeing Ferrari take a third victory on the bounce at the Singapore Grand Prix. After Charles Leclerc's successes in Belgium and Italy, Sebastian Vettel took the flag at the Marina Bay Circuit, with an upgrade package seemingly finally unlocking the SF90's potential. Article continues under video With Leclerc having secured a hat-trick of pole positions in those races, Wolff cut a frustrated figure post-race, despite Lewis Hamilton retaining a 65-point lead in the drivers' championship and the team still sitting 133 points above Ferrari in the constructors' standings. "You've got to be worried and on...
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