By Iain Carter at Medinah BBC Five Live golf correspondent

Five Live's golf correspondent Iain Carter on the legacy of Garcia, Tiger v Lefty and the Tom Lehman debate.

Garcia digs himself out of trouble at Medinah in 1999

Setting foot on the course here, I was like pretty much ever other golf fan visiting Medinah for the first time.

I wanted to see the 16th hole and, in particular, the tree from which in 1999 Sergio Garcia played his seemingly impossible approach to the green.

It was the six iron that prompted his famous scissor-kicking run up the fairway to catch sight of his miraculous shot.

On first sight, it appeared pretty straightforward, but once I'd walked uphill a few yards further on from the tree, it became apparent that the Spaniard's ball had needed to fly over a huge valley in front of the green.

This isn't apparent on television and makes that shot all the more remarkable.

In practice this week, Garcia entertained fans by taking his six iron out, walking to the famous tree and then in slow motion making a replica of the swing.

But instead of replicating his exuberant dash up the fairway of seven years ago, he hobbled along like a pantomime pensioner.

A quick thought on the course - it's a relentless but fair and likeable test.

What it lacks is a great short par four. The 15th, at 392 yards, is the only one measuring fewer than 400 yards.

Here's a name you wouldn't have expected as a potential winner - Charles Warren, a 31-year-old from Columbia, South Carolina, who has had just one top-10 finish all season and is playing his first USPGA.

He owes his place to this week's withdrawals of Wayne Grady, Bo Van Pelt, Steve Elkington and Mark Hensby.

Warren was the ninth alternate for a spot in the field, just as John Daly was when he triumphed in the 1991 USPGA.

How much distance will there be between Tiger Woods and Phil Mickelson on the leaderboard after playing together in the first round?

"Not much," according to 2005 US Open champion Michael Campbell.

"They'll pull each other along in their slipstreams. And Geoff Ogilvy (the US Open champion who makes up the stellar three-ball) has every chance to do as well as the other two."

American players say they want Tom Lehman in the US Ryder Cup team if he makes the top 10 on the qualification list.

Lehman, who could make it with a top-seven finish here, isn't so sure but says he was told by Chris DiMarco of the feelings of his likely team on the subject.

The captain's main concern is his putting, which he feels might be a liability to the American cause at the K Club.

American Billy Mayfair can't believe he is here. The 40-year-old received a bear hug from his best mate Mickelson on his arrival at Medinah just 12 days after surgery following the discovery that he was suffering testicular cancer.

"Two weeks ago today if you had told me I was going to be here, I would never have believed it," he said.

If you'd like to email Iain on a golfing topic, just fill in the form below. He'll answer a pick of them in his next column.

The BBC may edit your comments and not all emails will be published. Your comments may be published on any BBC media worldwide.