Immelman and Scott co-lead Byron Nelson

IRVING, Texas, May 13 (UPI) -- Trevor Immelman and Adam Scott were co-leaders Saturday after three rounds of the Byron Nelson Championship at Irving, Texas.

Immelman, who lost to Kim Furyk in a playoff last week at the Wachovia Championship, shot a 6-under 64. Scott, who had a four-stroke lead midway the third round, finished with a 69 to tie Immelman at 11-under 199 through 54 holes.

"It's a little disappointing not to keep it going because I played so good on the front nine," said Scott, who has three PGA Tour victories. "I'm still in the position of leading and I've just got to hang around for a bit longer tomorrow."

Immelman bogeyed the 72nd hole at the Wachovia last Sunday to drop into a playoff with Furyk.

Chad Campbell and Charley Hoffman posted 5-under 65s Saturday and are tied for fourth with Joe Ogilvie and Omar Uresti, who both shot 69.