Mercedes have introduced a new rear wing to their car for this weekend’s Saudi Arabian Grand Prix, journalist Albert Fabrega reports. The Silver Arrows were the third-fastest team at the opening race of the season in Bahrain. But as they look to close the gap on Red Bull and Ferrari, Fabrega has spotted a revised part on the W15. Mercedes looked like they could challenge for pole position in Sakhir after Lewis Hamilton led a one-two in FP2. However, the seven-time world champion could only manage ninth in qualifying, while George Russell was third behind Max Verstappen and Charles Leclerc. Ham…