(CNN) -- Veteran American Paul Goydos has become just the fourth player in PGA Tour history to break the 60-shot barrier after carding a remarkable 12-under-par 59 in the opening round of the John Deere Classic on Thursday. 

Goydos follows in the footsteps of Al Geiberger (1977), Chip Beck (1991) and David Duval (1999) after his 12-birdie blitz at the TPC Deer Run, Silvis, Illinois. 

However, Goydos, who at 46 is the oldest player to achieve the feat, is the only one of the quartet to break the barrier on a par-71. 

The Californian closed out the back nine in just 28 shots, with eight birdies in nine holes, while he took just 22 putts all day. 

Michael Letzig and Australian Matt Jones head the chasing pack after carding seven-under-par 64s, with Letzig also keeping a bogey off his card. 

Japan's Ryo Ishikawa is the only player to shoot a round of 68, which he achieved in the final round of The Crowns on his home tour on May 2. 

Meanwhile, Irishman Darren Clarke leads the field after the opening round of the Scottish Open at Loch Lomond. 

The former Ryder Cup player carded a six-under-par 65 to hold a narrow advantage over Graeme Storm, Damien McGrane and Edoardo Molinari in the traditional British Open warm-up. 

The 40-year-old Clarke has still not secured a place in the St Andrews field next week and he told reporters: "This is the first round and there's an awful long way to go, but of course I would love to qualify." 
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How many others have?
Who?
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How old is he?
How many birdies did he hit?
How many were in the last nine holes?
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golf
Veteran American Paul Goydos has become just the fourth player in PGA Tour
Paul Goydos
Veteran American Paul Goydos has become just the fourth player in PGA Tour history to break the 60-shot barrier
He broke the 60-shot barrier
Veteran American Paul Goydos has become just the fourth player in PGA Tour history to break the 60-shot barrier
No
eteran American Paul Goydos has become just the fourth player in PGA Tour history to break the 60-shot barrier
Three
Paul Goydos has become just the fourth player
Al Geiberger, Chip Beck and David Duval
Goydos follows in the footsteps of Al Geiberger (1977), Chip Beck (1991) and David Duval (1999)
Goydos
However, Goydos, who at 46 is the oldest player to achieve the feat
46
However, Goydos, who at 46
12
after his 12-birdie blitz at the TPC Deer Run, Silvis, Illinois
Eight
The Californian closed out the back nine in just 28 shots, with eight birdies in nine holes
28
The Californian closed out the back nine in just 28 shots
12-under-par 59
carding a remarkable 12-under-par 59
the John Deere Classic
carding a remarkable 12-under-par 59 in the opening round of the John Deere Classic on Thursday.
California
The Californian closed out the back nine in just 28 shots, with eight birdies in nine holes, while he took just 22 putts all day. 
Michael Letzig and Matt Jones
Michael Letzig and Australian Matt Jones head the chasing pack
seven-under-par 64s
Michael Letzig and Australian Matt Jones head the chasing pack after carding seven-under-par 64s
Ryo Ishikawa
Japan's Ryo Ishikawa is the only player to shoot a round of 68
Ireland
Meanwhile, Irishman Darren Clarke
the Scottish Open at Loch Lomond
Irishman Darren Clarke leads the field after the opening round of the Scottish Open at Loch Lomond
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unknown