Monday is the Labor Day holiday in the U.S. and to celebrate the U.S. Open is hosting its first Military Appreciation Day at Flushing Meadows, which will include discounted tickets for the military and appearances by high-ranking officers, who will conduct the ceremonial coin tosses before matches.
Federer, bidding for a sixth US Open and 20th major, will tackle Philipp Kohlschreiber later Monday.
Roger Federer crushed Germany's Philipp Kohlschreiber 6-4 6-2 7-5 to ease into the quarter-finals of the U.S. Open and leaving the five-time champion on a collision course for a semi-final showdown with Rafa Nadal.
Nadal, also aiming for his third U.S. title after wins in 2010 and 2013, looked at his best after dropping the opening set of his first two matches.
Women's quarterfinals: No. 9 Venus Williams beat No. 13 Petra Kvitova 6-3, 3-6, 7-6 (2); Sloane Stephens beat No. 16 Anastasija Sevastova 6-3, 3-6, 7-6 (4).
Federer did not face a break point and won in straight sets for the second time in a row after being pushed to five sets in each of the first two rounds.
Pliskova will next face American 20th seed CoCo Vandeweghe, who made the last eight for the first time by beating Lucie Safarova of the Czech Republic 6-4, 7-6 (7/2).
The U.S. Open runner-up previous year, Pliskova advanced to face either No. 20 CoCo Vandeweghe or unseeded Lucie Safarova.
Karolina Pliskova has won the first set 6-1 against American Jennifer Brady, a much better start for the women's No. 1 seed than in her last match.
While fans were still filing into Arthur Ashe Stadium, Nadal was wrapping up a clinical first set in 23 minutes.
With the match on serve at 2-1 to the German in the second set, the razor sharp Federer tore through six successive games to take the set and 1-0 lead in the third.
Standing between Federer and a semi-final berth is towering Argentine Juan Martin del Potro, who beat the former-world number one in the 2009 final to lift his only grand slam title.
Monday's match represented more head-to-head dominance for the 19-time major victor, who has never lost in his career against Kohlschreiber.