|AT&T Byron Nelson second round leaders|
|-9 J Walker (USA), J Curran (USA), S Bowditch (Aus); -8 C Percy (Aus), R Palmer (USA); -7 N Watney (USA), J Kelly (USA), J Randolph (USA), H Mahan (USA), A Finau (USA); Selected others: -6 J Speith (USA), Z Johnson (USA)|
Jimmy Walker carded a second-round 66 to take a share of the lead at the AT&T Byron Nelson in Texas.
American Walker joins overnight leader Steven Bowditch of Australia and Jon Curran of the United States at the top of the leaderboard on nine under.
Thirty-three players will resume their second rounds on Saturday after rain delayed Friday's start by three hours.
The 14th hole was reduced from a 406-yard par four to a 104-yard par three because of the poor weather.
PGA Tour vice president of rules and competitions Slugger White said they took the unusual step because the fairway was flooded after 4.5 inches of overnight rain.
"We had no place to go. We'd be losing balls and the conditions rendered the hole unplayable," he said.
Walker, who won the Valero Texas Open in March, hit eight pars and a birdie on the front nine, before moving up the leaderboard after a run of four birdies and two bogeys between the 11th and the 16th holes.
Bowditch followed up Thursday's 62 with a 68 which included seven birdies and six bogeys, while Curran shot eight birdies and two bogeys in his 63.
Masters champion Jordan Spieth is six under after finishing his second round with three birdies to card a 64.
"At least I got it to where I have a chance to make some noise," the world number two said.
"I'm going to need a round like today the next two days in order to be able to win, but I have got myself into contention. We'll see what happens."