 Complete the following phrase:  Liuzzi was confirmed with the team for the season at the launch of the STR2 on 13 February 2007. Unfortunately, during the first half of his season his races were plagued by mistakes similar to his former teammates. He seemed likely to score his first points of the season at Canada, but instead he crashed into the infamous Wall of Champions at the exit of the final chicane. He also faced constant speculation over keeping his seat, as the team openly courted both Sebastian Vettel and Champcar series champion Sébastien Bourdais. His teammate Scott Speed claimed Red Bull wanted to replace both himself and Liuzzi. Once Bourdais contract for 2008 was announced, Liuzzis performances improved. After being denied a world championship point in Japan by a post-race time penalty, he drove what many consider the best race of his Formula One career in 