Britain's Alfie Hewett progressed to the men's wheelchair singles second round at the US Open, but compatriot Gordon Reid was forced to retire injured after striking a microphone.
Reid retired after losing the first set to Spain's Martin de la Puente having aggravated an existing wrist injury.
Second seed Hewett beat Dutchman Maikel Scheffers 6-2 6-4.
Reid is due to team up with Hewett in the doubles as they bid for a sixth successive title.
Hewett, 24, claimed his seventh win in his last nine matches against former world number one Scheffers as the Briton began his bid for a third singles title in New York in impressive fashion.
There was disappointment for Lucy Shuker in the women's first round, however, as she lost 6-2 6-0 to world number one Diede de Groot of the Netherlands, who is aiming to complete a second successive calendar Grand Slam.
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