Conor Niland and Louk Sorenson have both reached the US Open main draw at Flushing Meadows, having come through the qualifying tournament.
This will be the first time in history that two Irishmen will contest the main draw at the event.
Niland's three-set victory against Dutch opponent Matwe Middelkoop means the Limerick man has qualified for the main draw at a second consecutive grand slam.
The Irish number one recorded a battling 2-6 6-1 6-4 win against Middelkoop in just under two hours in the third, and final round, of qualifying.
Sorenson defeated the world's 202nd-ranked player Martin Fischer of Austria in straight sets 7-6 (7/2) 6-1 to also reach the US Open main draw.
He took one hour and 32 minutes to do away with Fischer in New York. The Irishman ruthlessly converting four out of four break points to ensure his place in the competition proper.
Niland, currently ranked 199 in the world, saw off Slovakia’s Pavol Cervenak and Chinese Taipei’s Tsung-Hua Yang in the earlier rounds.
The Limerick man also reached the first round at Wimbledon in June.
Sorensen had earlier recorded a 6-4 6-1 victory against Portugal’s Gastao Elias to set up the clash with Fischer.
The victory over Elias made a mockery of Sorenson's world ranking of 614 with an authoritative win against a player ranked more than 300 places above him.