The Red sox optioned Walter to Triple-A Worcester on Monday.
Walter pitched well in a pair of appearances in the Grapefruit League with two scoreless innings and five strikeouts against no walks, but he wasn't ever likely to start the season in Boston. The left-hander is one of the better pitching prospects in the Red Sox system, and in 2022 he posted a 3.59 ERA over 11 starts with Double-A Portland and Triple-A Worcester across 57.2 innings. There's a good chance Walter makes appearances of some sort for Boston before the 2023 season comes to a end.