Athletics right-hander Daulton Jefferies will make his major league debut with a start in Game 1 of a doubleheader against the Rangers on Saturday, Susan Slusser of the San Francisco Chronicle tweets. Jefferies is already on the A’s 40-man roster, so they won’t have to make a corresponding move in that regard.
Jefferies, a California native who attended UC Berkeley, is in his fifth season with the A’s organization. The club spent the 37th overall pick on Jefferies in 2016, but his progress was slowed the next season when he underwent Tommy John surgery. Jefferies rebounded in 2019, though, with 79 innings of 3.42 ERA ball and great strikeout and walk numbers (10.6 K/9 versus 1.0 BB/9) between the High-A and Double-A levels. The 25-year-old is now the A’s fourth-ranked prospect at Baseball America and their No. 6 farmhand at FanGraphs.
It remains to be seen whether Jefferies will last with the A’s beyond their Saturday doubleheader, but he may stick around with an impressive performance. The A’s are running away with the AL West, but their rotation certainly hasn’t offered elite production so far. Sean Manaea, Jesus Luzardo and Chris Bassitt have been their best starters in a rotation that hasn’t gotten a lot from Frankie Montas, Mike Fiers or trade deadline acquisition Mike Minor.