Thiem began his season at the Qatar ExxonMobil Open as the top seed .
In late December 2017 , Coach Galo Blanco was added to Thiem 's team .
Thiem began Thiem 's season at the Qatar ExxonMobil Open as the top seed .
In late December 2017 , Coach Galo Blanco was added to Thiem 's team .