Thiem outduels Djokovic in seesaw Finals thriller

Austrian advances to semis, leaving Novak needing to beat old foe Federer

LONDON - Dominic Thiem landed one too many punches even for Novak Djokovic to handle.

In a seesawing crowd pleaser that lasted nearly three hours and featured a handful of momentum shifts in the third set, Thiem outlasted Djokovic 6-7 (5), 6-3, 7-6 (5) on Tuesday to become the first player to advance from the group stage at the ATP Finals.