By Mark Lamport-Stokes

BETHESDA, Maryland (Reuters) - Robert Rock's desperate bid to make his U.S. Open debut this week at Congressional Country Club was back on track on Wednesday after he finally obtained a United States visa.

The 34-year-old Briton had missed Tuesday's deadline for registration at Congressional because he was still in London arranging the necessary travel documentation.

However, Rock managed to get his visa at the U.S. embassy despite the short notice and was expected to arrive later on Wednesday, a European Tour official told Reuters.

While Rock will be delighted to take up his place in the year's second major, he is likely to set off in Thursday's opening round without having seen much of the hosting par-71 Congressional layout.

The Englishman is scheduled to tee off at 2:19 p.m. EDT in the company of Kevin Chappell and South Korean Kim Do-hoon.

Should he not make it to Congressional in time for the opening round, his spot would be offered to first alternate and fellow Briton Richie Ramsay, organizers said.

Ramsay also competed in the Walton Heath qualifier but opted to skip a playoff to decide the remaining U.S. Open berth in order to try to attend a friend's wedding reception.

After missing the flight to fellow professional Gareth Maybin's reception, Ramsay returned to the Walton Heath course on the outskirts of London but missed out on the playoff by a matter of minutes.

Swede Johan Edfors won the playoff in near darkness when he beat Denmark's Andreas Harto at the first extra hole.

(Editing by Julian Linden)