 Complete the following phrase:  Magnussen retained his seat at Haas for the season. The Haas VF-18 was a vast improvement on its predecessor, enabling Magnussen to compete at the front of the midfield. At the opening race in Australia, Magnussen lined up 5th on the grid, Haass highest ever starting position. He had ran as high as 4th, however both Haas cars would retire from the race after their wheels were fitted incorrectly during their pit stops. Magnussen then finished 5th in 