Best buds: One Direction's Niall Horan chats to world number three Rory McIlroy on the range.
One Direction: Horan gets some tips off McIlroy and then gets to work on his swing.
Warmed up and ready to go, @NiallOfficial is about to tee off at the #DDFIrishOpen pro-am. pic.twitter.com/9XvLVNOwKt
— DDF Irish Open (@DDFIrishOpen) May 18, 2016
Wrong direction: Horan misses a putt, much to the distress of two young girls.
Eyes on the prize: McIlroy is presented with his Player's Player of the Year Award.
Blinkered: Former champion jumps jockey AP McCoy stares into the eyes of McIlroy.
And they're off: McCoy lets rip on the first tee.
Photo finish: McIlroy and McCoy pose with 10-time leading Cheltenham Festival jockey Ruby Walsh
Weighed in: Walsh caddies for McCoy.
Weighed down: But looks to have quickly regretted the decision.
Just for laughs: McIlroy on the first tee with Irish racehorse owner JP McManus.
Gallop: Graeme McDowell goes for a light jog down the fourth.
China's champ: Recent European Tour winner Hao Tong Li pulls a face.
Tackling the course: Former rugby player Brian O'Driscoll tees off on the 14th.
Light at the end of the tunnel: Padraig Harrington tees off the narrow 13th.
Captain Clarke: Darren Clarke will get a good view of potential 2016 Ryder Cup players this week.
The Master: Danny Willett and his caddie find a line off the first tee.
Keeping the white safe: 1985 World Snooker champion Dennis Taylor tees off.
Conducting the orchestra: Miguel Angel Jimenez in buoyant mood, as always.
Not Bernd: Austria's Bernd Wiesberger feels the cold Irish air.
Defending champ: Soren Kjeldsen is presented with a birthday cake.