 Complete the following phrase:  The season was the first time that two four-time World Champions, Hamilton and Vettel, would be competing for a fifth title and was billed as the Fight for Five by journalists and fans. Hamilton started the season by taking a record seventh pole position in Melbourne, but finished second behind Vettel, who used a timely virtual safety car period triggered by the stricken Haas of Romain Grosjean to pass Hamilton before successfully defending the position until the finish. After finishing on the podium in 