Munoz (ankle) threw a bullpen session Tuesday, Corey Brock of The Athletic reports.
Munoz was immobilized for 12 weeks (six in a cast, six in a walking boot) following surgery shortly after the season to fuse two bones together in his right ankle. However, he began a throwing program a while ago and has now progressed to mound work. Barring any setbacks, the hard-throwing reliever will be ready to roll for Opening Day.