Sinner tested positive for a banned substance twice in March but was absolved of fault or negligence.

The Scot’s final match was a 6-2 6-4 defeat by Taylor Fritz and Tommy Paul alongside Dan Evans.

Dan Evans, seeded 19th, had earlier crashed to a straight-sets defeat to Bernabe Zapata Miralles.

Murray and Joe Salisbury lost a deciding doubles rubber for the second straight match

Murray and Salisbury were beaten by Rajeev Ram and Jack Sock in the deciding doubles just before 1am.