|US Open 2019|
|Venue: Flushing Meadows, New York Dates: 26 Aug – 8 Sep|
|Coverage: Live text and BBC Radio 5 Live Sports Extra commentary on selected matches on the BBC Sport website and app. Click here for Live Guide.|
The Britons, who were knocked out of the singles competition this week, won 6-3 1-6 6-1 on court nine.
Compatriot Jonny O’Mara is also through, alongside partner Marcelo Arevalo from El Salvador.
They beat German Mischa Zverev and Frenchman Benoit Paire 4-6 6-4 6-1.
In the mixed doubles, Britain’s Joe Salisbury and American Desirae Krawczyk booked their place in the second round with a comfortable 6-2 6-2 victory over Americans Hailey Baptiste and Jenson Brooksby.
Meanwhile, Britain’s Neal Skupski and Spanish partner Maria Jose Martinez Sanchez lost 6-4 6-3 to fourth seeds Ivan Dodig and Latisha Chan from Bosnia and Herzegovina and Taiwan respectively.
Elsewhere, Belarusian Victoria Azarenka and Australian Ashleigh Barty, seeded eighth, beat Romanian Monica Niculescu and Russian Margarita Gasparyan 4-6 6-1 6-1 to progress to the second round of the women’s doubles.
And American teenagers Catherine McNally and Coco Gauff – who won the Washington Open together this month – triumphed 7-6 (8-6) 6-2 against German Julia Gorges and Czech Katerina Siniakova.
Gauff, 15, takes on world number one Naomi Osaka in the third round of the women’s singles on Saturday.