The 16 - time world champion had won the previous three stagings of the World Series event .
The 16 - time world champion faced a tough task in keeping his perfect record in tact when he took on the world number one in this year 's final .
The 16 - time world champion had won the previous three stagings of the World Series event , but faced a tough task in keeping his perfect record in tact when he took on the world number one in this year 's final .