Giolito (elbow) was throwing in the field at Fenway Park on Friday, Jen McCaffrey of The Athletic reports.
Giolito joined the Red Sox in the offseason to be part of Boston's starting rotation. However, he never had the chance to suit up in the regular season after suffering a partial UCL tear and flexor strain in his right elbow during spring training, which required an internal brace procedure in March and a trip to the 60-day injured list. That type of procedure carries a 10-12 month recovery window, so the fact that Giolito is throwing just five months after surgery shows how well the 30-year-old is progressing in his rehab. Barring any setbacks, he could begin throwing off a mound before the end of the season.