Doug Ghim has been the week's surprise package, with the 24-year-old American sitting three shots of the lead heading into the final round and in the penultimate pairing alongside Justin Thomas.

Ghim was asked by reporters on Saturday if he harboured hopes of making the US Ryder Cup team, to which he replied: "Yeah, I don't know if you noticed, I'm like 257th in the world."

Formerly the number one amateur, Ghim was outside the world's top 500 last year but has been steadily climbing and finished tied for fifth at the American Express in January.

There are plenty of big names well positioned to make their move on the final day.

Three off the lead are Americans Justin Thomas and Doug Ghim, closely followed at nine under by countryman Brian Harman, England's Paul Casey and Spaniard Jon Rahm.

Sergio Garcia, Matt Fitzpatrick and Chris Kirk may also hold an outside chance as they begin Sunday's round five off the pace.

-13 L Westwood (17:50)

-11 B DeChambeau (17:50)

-10 J Thomas, D Ghim (17:40)

-9 P Casey, J Rahm (17:30), B Harman (17:20)

Lee Westwood headed into the final round of the Arnold Palmer Invitational with a one-shot lead over Bryson DeChambeau last week, an advantage the American was able to overturn as he came through to win at Bay Hill.

This time the 47-year-old Westwood is two shots clear of his young rival as he chases a first PGA Tour win since 2010.

"It's like the rematch," smiled Westwood after finishing his round on Saturday. "That will be fun. I like playing with Bryson, he is a breath of fresh air."

DeChambeau added: "I love it, Westy is a fierce competitor and I look forward to the challenge again with him."

We couldn't have put it better ourselves, Bryson.

For the second week in a row on the PGA Tour, we have final-day showdown between Lee Westwood and Bryson DeChambeau.

Get the popcorn, it should be a cracking few hours.

Image source, Getty Images