Madison Keys -14- (USA) def  Dominika Cibulkova -35- (SVK) | 61 63
Mess with the bull, you get the horns.
It’s unwise to trade pace with Madison Keys. She will always send the ball back twice as fast. On Monday afternoon, Dominka Cibulkova tried going toe-to-toe with Madison – and it backfired tremendously.
Keys had five break chances before the first changeover, and finished the match converting 4-of-11. Both hit big, Keys just hit bigger – earning 25 winners to Cibulkova’s 7. Madison allowed Dominka a single hold in the first and just two in the second.
Last year’s Finalist will face Carla Suarez Navarro in the Quarterfinals. All three of their previous matches have gone the distance, including their most-recent at the 2016 Summer Games in Rio. Madison won all three.
NEXT:  Madison Keys -14- (USA) vs  Carla Suarez Navarro -24- (ESP)
R4: def  Dominika Cibulkova -35- (SVK) 61 63 | Arthur Ashe Stadium
R3: def Aleksandra Krunic -49- (SRB) 46 61 62 | Arthur Ashe Stadium
R2: def Bernarda Pera -92- (USA) 64 61 | Louis Armstrong Stadium
R1: def Pauline Parmentier -71- (FRA) 64 64 | Arthur Ashe Stadium
 Madison Keys -14- (USA)
Last year, she became a Grand Slam Finalist for the first time right here in Arthur Ashe Stadium, upsetting World #4 Elina Svitolina en-route to the Championship match. This May at Roland Garros, she reached her third career Major Semifinal, making the Final-4 without dropping a set. A proud member of Team USA, she reached the Bronze Medal Match in Rio; and earlier this year, earned the deciding-victory over France, lifting her teammates back into the Fed Cup Final. Ranked as high as World #7, she owns 3 WTA Singles titles and is competing in her 9th US Open. From Rock Island, Illinois – Please welcome 2017 US Open Finalist…Madison Keys.
 Dominika Cibulkova -35- (SVK)
Over the weekend, this Grand Slam Finalist upset World #4 and 2016 Champion Angelique Kerber to reach today’s 4th-Round match. She owns 8 WTA Singles titles and earlier this year – reached her 20th Tour-level Final in Budapest – her 21st in Strasbourg – and at Wimbledon, became a Grand Slam Quarterfinalist for the 8th time. In 2016, she captured the title at the year-end WTA Finals in Singapore and finished the season ranked inside the top-5 for the first time. An Australian Open Finalist in 2014, she’s the first woman from Slovakia ever to reach the championship match at a Major. Competing in her 11th US Open, from Slovakia – Please welcome…Dominika Cibulkova.