As anticipation builds over Tiger Woods' official comeback after nearly a year rehabilitating from a spinal fusion, two former professionals have offered a tempered view of what to expect from the 14-time major champion in 2018.

Woods completed 72 holes for the first time in three years when he finished tied for ninth in a field of 18 at the Hero World Challenge in the Bahamas in December－an unofficial event on the PGA Tour.

That was an appetizer before he continues his return at this week's Farmers Insurance Open at Torrey Pines in southern California.

Woods, however, faces at least one immovable obstruction, based on historical precedent, according to Brandel Chamblee and Bill Mallon.

Chamblee, now a Golf Channel analyst, said Woods appears to have solved his body and swing issues, but "chipping yips" and age make it nearly impossible to imagine him recapturing his old magic.

Mallon agreed, adding: "He was so good once that I think it is hard to dismiss him, but coming back after four back surgeries and multiple left knee surgeries－I'm sure he's got arthritis－I think it will be tough," the golf and Olympic historian said in a telephone interview.

"At that level, the slightest incremental deterioration physically, even though golf is not football, still has huge physical demands to do it without pain."