Jordan Spieth accepts that not many people believe he has any chance of winning this week’s USPGA Championship.

The 25-year-old has won three majors during his career – the Masters and US Open in 2015 and the Open Championship two years ago – but has been in terrible form so far this season and has yet to clinch a top-20 finish in 13 starts.

Spieth’s last career victory was the 2017 Open Championship at Royal Birkdale and he is not expected to challenge at Bethpage Black. He said: “I’ll be flying under the radar but I don’t mind that.”

Brooks Koepka has also won three majors, including last year’s PGA Championship, and is 11.00 to triumph again this week while Spieth can be backed at 41.00.

Spieth could only finish in a tie for 29th at his hometown AT&T Byron Nelson last week but he was pleased that he shot three rounds in the 60s for the first time this season.

“I don’t take the disappointment. I take more confidence than disappointment,” he added.

“The actual result doesn’t show really how well I played. We kind of had a tough draw the first two days and then still be – what was it 11-under for the week? – is solid playing on any golf course.”

Meanwhile, world number five Justin Thomas will not be involved in the second major of the year as he has not recovered from a wrist injury.

The 26-year-old, who won the tournament at Quail Hollow in 2017, has been struggling with the injury since featuring at last month’s Masters and was also forced to miss the recent Wells Fargo Championship.