Tennis: Aussie men shine at Citi Open in Washington
On the opening day of the ATP tournament in Washington on Monday - which was haltered by a rain delay - Millman, Duckworth and Thompson all emerged triumphant in straight sets.
Millman was too good for local hopeful Denis Kudla 7-5 6-0, winning in just over an hour.
A total of five aces and as many break points helped Millman secure a second-round meeting with Marcos Baghdatis.
Qualifier Duckworth got the better of another American, overcoming Tim Smyczek 7-5 6-1, and was never broken as he booked a showdown against top seed John Isner.
As for Thompson, he defeated Victor Estrella Burgos 6-3 6-2.
Elsewhere, Benjamin Becker was upstaged by Daniel Evans 6-2 6-1 in less than 50 minutes.
Vasek Pospisil won the opening set but fell to a 1-6 6-2 7-6 (7-4) defeat against Yuichi Sugita and Taylor Fritz saw off Dudi Sela 6-4 6-3.
Jared Donaldson overcame fellow qualifier Vincent Millot 5-7 6-2 6-4, Bjorn Fratangelo prevailed 4-6 6-2 6-4 over Alex Kuznetsov, while Adrian Mannarino outlasted Frances Tiafoe 7-6 (7-4) 7-5.