The A's called up top prospect Franklin Barreto on Saturday morning, giving the middle infielder his first major league call-up with Chad Pinder hitting the 10-day disabled list with a strained left hamstring.
In the span of just over a week, the A's have promoted both of their highest rated position player prospects in Barreto and third baseman Matt Chapman, though Chapman himself is on the DL with a knee infection.
Barreto, 21, is hitting .281 with eight home runs and 32 RBI for Triple-A Nashville. He ascended to the top of Oakland's prospect rankings shortly after being acquired from Toronto in the Josh Donaldson trade of November 2014.