World number one Dustin Johnson is feeling in confident mood heading into the weekend, with the American just four shots behind leader Louis Oosthuizen at the halfway stage of the 149th Open Championship.

South African Oosthuizen (9/4 Outright Winner) will start round three with a two-shot advantage over Collin Morikawa, with the duo shooting 65 and 64 on Friday to leave them on -11 and -9 respectively.

2017 champion Jordan Spieth (9/2 to lead the field after the 3rd round) is on his own in third on eight-under par, with Johnson tied for fourth on -7 along with Scottie Scheffler and Dylan Frittelli.

DJ, the 2020 Masters champion, is looking for his third Major title and has four previous top-10 Open Championship finishes under his belt, including a T2 finish when Royal St George’s last held the event in 2011.

Johnson – 8/1 to lift the Claret Jug on Sunday – carded one of the standout rounds on Friday, taking advantage of the good conditions to fire a five-under par 65, a round that included seven birdies.

Tied for fourth on -7, the 37-year-old is in confident mood and should enjoy playing alongside fellow American Scheffler on Saturday.

Johnson admitted: “I like the position I’m in going into the weekend. I’m still going to have to play some really good golf if I want to contend on Sunday though.”

“The course is definitely firming up. It was firmer this afternoon and it’s definitely going to keep getting firmer if the weather stays like this.”

The concern for the chasing pack though is Oosthuizen’s 2010 success at St Andrews, when he lead from the second round and ended up lifting the Claret Jug, eventually winning by seven shots.

You have to scroll down the leaderboard to T7 to see the closest British challenger, with England’s Andy Sullivan on six-under-par, while Paul Casey (18/5 Top Five Finish) is a further shot back on -5.

Whenever you bet on Golf, Betfred.