Duckworth broke for 6-4 to take the set, with Kecmanović's resilience a 5 minute hold for 1-1 saving all break points and Duckworth saving two in a hold for 3-2.
Duckworth broke for 2-0 and again for 4-2, clinical in sealing it 6-3, though Kecmanović broke for 2-3 in a deuce game to briefly threaten.