Shane Lowry and Graeme McDowell off the pace at World Cup
Graeme McDowell and Shane Lowry struggled at the World Cup of Golf in Melbourne, recording rounds of one-over and four-over respectively.
The Ireland pairing ended up in 16th place in the team standings after the first round.
McDowell had enjoyed one of the shots of the day, holing a long-range chip for an eagle on the par-four ninth, but hit double-bogeys on the sixth and 18th.
American Kevin Streelman bogeyed two of his last three holes to fall back into a share of a one-stroke lead on five under with Denmark's Thomas Bjorn after the first round of the $8m (£4.9m) tournament.
Streelman, a late choice to represent the defending champion United States team, had torn up Royal Melbourne's back nine with five birdies in six holes but dropped shots on the tricky 16th and 18th to card a 66 and join Bjorn on five-under.
The pair finished a stroke ahead of Welshman Stuart Manley, South Korea's K.J. Choi and Scotland's Martin Laird.
"I was very pleased with that start," the 35-year-old Streelman said after upstaging world number seven compatriot Matt Kuchar (71), who won the last World Cup for the US with Gary Woodland in 2011 when it was purely a team event. It's just an incredible golf course, I love it... I just had a lot of fun there to be honest."
Gareth Maybin and Michael Hoey are both some way off the pace after their first rounds at the South African Open.
Maybin's 72, which mixed three bogeys with three birdies, left him eight behind Matthew Nixon.
This year's Russian Open winner Hoey was three shots further back in Gauteng after a 75 which included six bogeys.
Maybin mixed three birdies with as many bogeys while county Down-based Simon Thornton was the leading Irishman on one under after a 71.
Peter Lawrie shot an opening 74 with European Ryder Cup captain Paul McGinley joining Hoey on 75 and Damien McGrane hitting a 77.