Novak Djokovic extends his streak to 26.
The world number 1 has never given a chance to Jan-Lennard Struff who he already defeated at the Australian Open and last week in the Masters 1000 moved from Cincinnati.
Djokovic finished 63 63 61 by winning the thirteenth consecutive qualification for the round of 16 of the US Open.
Thanks to his first quarter-final in a Masters 1000, Struff reached the best ranking of number 29 in the world.
In New York, however, he never went beyond the third round.
Djokovic will challenge Pablo Carreno Busta, seeded number 20 in the second round. The Spaniard has overtaken the Lithuanian Ricardas Berankis, never in the second round in a Grand Slam, 64 63 62 in less than two hours.
In the women's draw, former world No. 1 Naomi Osaka risked losing with 18-year-old Marta Kostyuk, a match that seemed to have already been won in the second set and compromised at the beginning of the third.
Kvitova overtakes Jessica Pegula, Kerber doesn't give a chance to surprise Ann Li.
Brady takes out Garcia.