Glen Hnatiuk and Tim Petrovic hit six-under-par 65s to lead after a rain-affected first round of the St Jude Classic in Memphis.

A two-hour delay due to bad weather meant that 78 players were still on the course when darkness fell and they must return at 1215 BST on Saturday to complete their rounds.

One shot behind Canadian Hnatiuk and American Petrovic are a group of five players - Matt Kuchar, Justin Leonard, Garrett Willis, Notah Begay III and David Howser.

Jay Haas is also on five-under after 16 holes.

Deane Pappas, Steve Pate and Doug Barron are two shots off the lead following four-under 67s.

Neither of the two leaders have won on the PGA Tour and the Hnatiuk refused to look too far ahead.

"You can't win a golf tournament on Thursday," he said but added that he would not feel any pressure at heading the field.

"I have no problem looking at the leaderboard and seeing where I am.

Form recaptured

"It would probably bother me more if I didn't look at it at all because I would be wondering anyway," said the 37-year-old, who picked up four shots in the first seven holes.

Petrovic, who has two top-20 finishes on the PGA Tour this season and did not drop a shot in his first round, says he is back to his best ever form.

"Last year was a really good year for me, and this round was probably the closest I've felt to the sort of ball-striking I enjoyed 12 months ago," said the 35-year-old.

"I was just getting up and hitting shots and not having to fool around with it.

"Whatever shot I wanted to hit...I could do it. It was just there."

First round scores from the FedEx St Jude Classic in Memphis
(US unless stated, par 71, (x) denotes amateurs)

65 Glen Hnatiuk (Can), Tim Petrovic
66 Notah Begay III, David Howser, Matt Kuchar, Justin Leonard, Garrett Willis
67 Doug Barron, Brenden Pappas, Deane Pappas, Steve Pate
68 Bob Heintz, Bob May, Spike McRoy, Sean Murphy, Nick Price (Zim), Paul Stankowski, David Toms
69 Tommy Armour III, Cameron Beckman, Len Mattiace, David Morland IV, Rodney Pampling, Carl Paulson, Loren Roberts, Kirk Triplett
70 Michael Allen, Glen Day, David Edwards, Donnie Hammond, Mike Heinen, Mike Hulbert, Dicky Pride, Brent Schwarzrock, Esteban Toledo, Woody Austin
71 Bob Burns, Brian Claar, Bobby Cochran, Cody Freeman, Bill Glasson, Peter Jacobsen, Geoff Ogilvy, David Peoples
72 Robert Allenby (Aus), Tim Herron, Tripp Isenhour, Hank Kim, Bryce Molder, Matt Peterson, Chris Riley, Willie Wood, Stephen Ames
73 Paul Azinger, Bob Boyle, Wayne Grady, Blaine McCallister, Jim McGovern Casey Wittenberg
74 Mathew Goggin, Brian Henninger, Lee Porter, Brett Wetterich, Jay Williamson
75 Fulton Allem, Eduardo Herrera (Col), Mike Standly
76 Mike Bennett, Chad Campbell, Brad Elder, Kevin Wentworth
77 Brandt Jobe, Jonathan Kaye
79 Jerry Smith
81 Brad Fabel, Michael Muehr