Wang broke for 1-0 before Keys saved all three break points in a hold for 1-2, then broke for 2-2 in a gruelling 6 minute game, but Keys held nerve to win the tiebreak.
Keys broke for 1-0 saving two break points, then broke again for 5-4 after Wang levelled at 4-4, clinching 6-4 with a hold for 6-4.