Williams suffered the injury Monday while doing a soft-toss drill with his college-aged son, Jacob. It is the third time Williams has broken that same bone. He did so in 1995 and 2000 during his playing career, which caused doctors to insert a metal plate in the foot.
"I hope he's still a fast healer," D-backs manager Kirk Gibson said. "Hopefully, he'll be back before Opening Day, but we don't know that."
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The timing of the injury is unfortunate as Williams is heading into his first season as third-base coach in the big leagues.
"Spring Training games are probably important for him in getting to know arms, knowing our baserunners and working with Gibby on signals, which will be important when the season starts," general manager Kevin Towers said.
The D-backs have used different third-base coaches in Williams' place, including bullpen coach Glenn Sherlock and Triple-A Reno manager Brett Butler.
If Williams is not available by the April 1 opener against the Rockies, the D-backs have a number of different options. They could use a coach who is currently on the staff, like bench coach Alan Trammell, and have Williams serve as bench coach.
Or they could decide to use Butler. The issue with adding another coach is that Williams would either have to watch games from the clubhouse or the D-backs would need permission from the opposing team to have an extra coach on the bench.
Williams is still doing his other duties, working with infielders the last couple of days while wearing a walking boot.