SANTA CLARA — As devastated as Ian Williams felt two years ago when he went undrafted out of Notre Dame, he can now look back on that moment and realize how much the rejection meant to his career.
He landed with the 49ers, and is the leading candidate to win the starting nose tackle job for the NFC champions as he begins his third NFL season.
"It hurt, but looking back at it, it was probably the best situation that could have ever happened," Williams said after a recent practice. "I was a young kid, expecting this, expecting that. It kind of put me back to my place, and coming here and getting back to work really propelled me to where I am now.
"I lost sight of the goal that I set. Drastic things usually get you back on track."
The expectations for Williams are high heading into the team's exhibition opener Thursday night at home in Candlestick Park against Peyton Manning and the Denver Broncos.
San Francisco lost both its starter and backup at the position to free agency this spring, leaving Williams and veteran newcomer lineman Glenn Dorsey to push each other in training camp — yet Williams has more experience. Dorsey could spend some time at defensive end, too.
Williams prepared himself for this opportunity by losing 25 pounds from his previous playing weight during the offseason, bringing him down to 305 and right where he hopes to stay this season. Defensive coordinator Vic Fangio has noticed an improvement in Williams' agility and quick step off the snap.
"I can feel a great difference. We haven't been in a game yet, but just being out in practice and working out here just really got me ready and going against our O-line the past two years has really gotten me ready for what I have in front of me," Williams said.
Williams always stayed upbeat as he paid his dues buried on the depth chart and regularly inactive for game days during his first two seasons.
"It was vital to where I am right now," he said. "Just coming into a good situation and having a veteran crew around me and guys who really took me under their wing and taught me even though I was coming in to compete at the position, I really came into a great situation."
NOTE: In Thursday's game, Demarcus Dobbs is slated to start in place of Justin Smith as the All-Pro Smith nurses an injured finger. Fangio also said Craig Dahl will start at free safety and rookie Eric Reid will enter later.
PRESEASON49ers vs. Broncos
WHEN: Thursday, 6 p.m.
WHERE: Candlestick Park
TV: KPIX (Ch. 5)
RADIO: KGO (810 AM), KSAN (107.7 FM)