It'll be an emotional day for Jefferies, whose last MLB appearance came nearly two years ago as a member of the A's - the only team for which he's ever pitched.
Considering that was the second Tommy John procedure of Jefferies' career, his return to a big league mound is all the more remarkable.
Jefferies sports a solid 3.93 ERA in his minor league career, with a strong 25.7% strikeout rate and a superlative 3.1% walk rate.
Jefferies was excellent for the Giants this spring, pitching 14 innings and allowing just four runs (2.57 ERA) on 14 hits and three walks with 16 strikeouts.
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