Wozniacki slams the door on Keys

Nadal reacts to ‘physically and mentally’ tough Monte Carlo Masters quarter-final win over Pella

Caroline Wozniacki proved too much for Madison Keys in the last 16 of the US Open as she progressed by trouncing the American in straight sets.

Wozniacki has been impressive all week. Her extremely high level of consistency has been an aspect of her game that has been missing since she last reached the final at a grand slam back in 2014.

That form continued on Sunday as she disposed of Keys 6-3, 6-4.

The Dane got off to the better start as she held comfortably and then applied serious pressure to Key's serve however the American would survive that initial scare.

At the next time of asking though Wozniacki got the break she was after to lead 3-1 and she was ruthless in closing out the set from there.

The second stanza saw Wozniacki break twice. While Keys did record a break of her own it was not enough to force the encounter into a decider as Wozniacki took the set 6-4 and with it the match.

A hallmark of the 26-year-old's play on the day was her sound decision making. When she was required to play aggressively she did so with control and accuracy, when she was required to defend, which was not all that often, she did so with smart ball placement and resilience.

Wozniacki now meets with Anastasija Sevastova in the quarter-finals.

Sevastova was superb on Sunday as she ousted 13th-seeded Johanna Konta 6-4, 7-5 to become the first Latvian woman to make the final eight at a grand slam since Larisa Savchenko in 1994.

Elsewhere at Flushing Meadows, Roberta Vinci, last year's US Open runner-up, also advanced to the quarter-finals as she beat 99th-ranked Lesia Tsurenko 7-6 (5), 6-2.