"Then I chose to start hitting the driver and bad things started happening with that shaft", said Vegas, who made four bogeys over the final 10 holes.
A desperate attempt to secure a renewal hit several snags and Vegas only arrived at the course by helicopter a couple of hours before his scheduled tee time on Thursday.
After a madcap dash to put a bag together, Vegas eventually made it to his tee-off time, but unsurprisingly struggled to a five-over-par 76.
Vegas, who was born in Venezuela and now lives in the US, learned that his visa had expired the same day he was supposed to travel to the UK.
In an attempt to resolve the issue, his new passport was held up and then bad weather delayed his connecting flight from Houston to New York City on Tuesday afternoon.
Vegas realised only last week his visa had expired - on the day he checked it.
"As long as I had a shot of making it, I was going to go for it", Vegas said. I was supposed to get here on Friday. And then he learned he had applied for the wrong visa, delaying the process more. From there, he took a helicopter to Carnoustie, arriving around two hours ahead of his tee time.
He waited in his vehicle outside the embassy in Houston for seven hours for it to arrive.
He finally arrived in Glasgow, Scotland, early Thursday morning, but there was another problem: his clubs hadn't shown up.
"I grabbed the clubs, went out and hit about 20 balls". "Luckily they were going forward, which was nice".
"But at the end of the day, I gave it a try. We fixed it and I was supposed to be in Houston on Tuesday morning to be here Wednesday", said Vegas, who missed the cut on his British Open debut at Royal Birkdale past year. "I wouldn't miss it for anything".