Dustin Johnson and Thomas Bjorn hold a share of the lead on the opening day at the US PGA Championship.

Johnson took advantage of the good scoring conditions at Whistling Straits to move a shot clear during his opening round but is now level with Bjorn, with the advantage of more holes to play.

.@djohnsonPGA has the early lead of the #PGAChamp. This eagle sure didn't hurt... https://t.co/cuFJknVxn7

— PGA Championship (@PGAChampionship) August 13, 2015

Darren Clarke is the first of the Irish players in action as he tees off, with Rory McIlroy due to start at 7.20pm Irish time.

Of the rest of the Irish players in the field, Shane Lowry begins at 6.40pm, Graeme McDowell starts at 7pm and Padraig Harrington will be last to tee-off at 7.30pm.