Golf – The 146th Open Championship – Royal Birkdale – Southport, Britain – July 21, 2017 USA’s Matt Kuchar plays his approach to the second hole during the second round REUTERS/Paul Childs

American Matt Kuchar bogeyed the 18th hold to slip back to third place at the British Open as joint leaders Jordan Spieth and Brooks Koepka prepared for a Friday afternoon round in challenging conditions.

Clubhouse leader Kuchar’s one-over-par round of 71, in gusty winds at Royal Birkdale, was only slightly soured by his final hole slip-up, and with rain and stronger winds expected later, his rivals will have to produce outstanding golf to maintain their one-stroke advantage.

The 39-year-old Kuchar, who has yet to win a major championship, is four under-par after two rounds, with Spieth and Koepka sat on five under from their opening rounds.