Third-string quarterback Craig Nall solidified a roster spot by leading the Green Bay Packers on three second-half scoring drives in a 21-20 victory over the Tennessee Titans.

Billy Volek threw a 13-yard touchdown pass to Eddie Berlin with eight seconds left in the game to pull the Titans to within a point, but the 2-point conversion failed when the ball went off the hands of Berlin wide open in the end zone.

Nall completed 12 of 19 passes for 182 yards.

A fifth-round pick from Northwestern (La.) State who had been erratic all preseason, Nall led the Packers on scoring drives of 73, 46 and 82 yards after rookie John Simon returned the second-half kickoff 100 yards for a touchdown that gave Tennessee a 7-3 lead.

It was the second TD return allowed by the Packers this week. Cleveland's Andre Davis had a 93-yarder on the opening kickoff Monday night.

Nall threw TD passes of 16 and 25 yards to Charles Lee after an initial series in which he completed 5 of 6 passes for 50 yards, setting up Ryan Longwell's 27-yard field goal that made it 7-6.

After Marques Anderson recovered Neil O'Donnell's fumble at midfield, Nall threw a 16-yard strike to Lee, then connected with Robert Ferguson for the 2-point conversion from 7 yards out after a penalty.

Tennessee tied it at 14 when running back Robert Holcombe took a short dump-off pass from Volek and rumbled 25 yards to the 1, where he fumbled into the end zone. The ball was recovered by wideout Justin McCareins for a 14-all tie with 12:19 left.

Nall hit Lee from 25 yards out after another fumble by Holcombe.

The Titans, who sat seven starters Monday night at Minnesota, used their final exhibition as a tuneup for the regular season, playing their starters well into the second half.

Brett Favre played just two series and most of the Packers starters were on the sideline by the second quarter.

Still, the Packers took a 3-0 halftime lead as their backups helped stymie Eddie George (1.8-yard average on eight carries) and Steve McNair, who fumbled three times in the second quarter.

Terry Glenn made his long-awaited debut for the Packers after practicing just three times since spraining his left knee Aug. 7.

He caught one pass from Favre, an 8-yard hitch that drew an ovation from the crowd of 62,485.

"I was wondering what it was going to be like after I made that first catch from the Hall of Famer. It was great," Glenn said at halftime.

Favre was 5-of-10 for 57 yards.

Glenn, acquired from New England in the offseason, dropped his only other pass from Favre, then caught a nifty 25-yard pass from Doug Pederson to set up Longwell's 30-yard field goal in the second quarter.

Joe Johnson set up the score by recovering McNair's first fumble, at the Tennessee 38.

For the first time this preseason, the Packers had their entire starting defense on the field as cornerbacks Mike McKenzie (calf) and Tyrone Williams (groin) returned to the lineup.

But their offense remained off rhythm.

Running back Ahman Green, who was held to 11 yards on 10 carries in Nashville last season, ran nine times for minus-1 yard.

Packers fullback Chris Gall left in the second half with a quadriceps injury.

-- Associated Press