Yamamoto (shoulder) made his most recent rehab start at Low-A St. Lucie on Thursday, working four innings while striking out five and giving up a run on three hits and no walks.
Now four starts into his rehab assignment, Yamamoto has made his last three turns with St. Lucie after kicking off his minor-league stint in the rookie-level Florida Complex League. He's continuing to build back up for a starting role in case the Mets require an extra arm for the rotation later in September, but Yamamoto is more likely to slot into the bullpen if the big club suffers no further attrition to its pitching staff in the next week or two.