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Oakland A's Minor League Notebook: More roster changes

There were several changes made to pitching staffs up-and-down the Oakland A's farm system on Wednesday.

The mid-season changes have begun for the Oakland A's system. For the second time this week, the A's made several roster changes up-and-down the system.

At the top, the A's made the expected move to send Tuesday spot starter Dillon Overton back to Nashville after his strong start against the Houston Astros (6.1 innings/ 3 earned runs). In his place, the A's promoted utilityman Arismendy Alcantara to Oakland. Alcantara takes over the role vacated by Tyler Ladendorf, who was sent to Triple-A on Tuesday.

The A's sent Brandon Mann -- who started for Overton in Nashville on Tuesday -- back to Double-A Midland and promoted right-hander Raul Alcantara from the RockHounds' roster. Alcantara will be making his Triple-A debut. He has a 4.80 ERA and 73 strike-outs in 90 innings this season -- his first full season back from 2014 Tommy John surgery.

Hard-throwing right-hander Lou Trivino has joined the Midland bullpen from Stockton. Trivino, who has hit 98 on the gun this year, has a 3.02 ERA with 49 strike-outs in 41.2 innings so far this season.

The A's also made several moves on their Single-A pitching staffs. The Stockton Ports added right-hander James Naile, who joins his fourth A's affiliate of the year. Naile has spent most of the season with Low-A Beloit, but made two starts for both Nashville and Midland. He has a 3.24 ERA and 111 innings for Beloit, Midland and Nashville. This is Naile's first full professional season.

Switching spots with Naile is left-hander Zack Erwin, who heads from Stockton to Beloit. Erwin, who is also in his first full pro season, has struggled this year. He had a 6.53 ERA in 80 innings for the Ports.

Right-hander Brendan Butler has also joined the Snappers' roster. He joins Beloit from Vermont, where he had a 1.95 ERA in 37 innings. The hard-throwing right-hander made two appearances for Stockton earlier in the year as a reliever, but has been built up as a starter with the Lake Monsters. Right-hander Nolan Blackwood becomes the first member of the A's 2016 draft class to reach full-season ball, joining the Snappers from Vermont. The 6'5'' reliever had four saves in five opportunities with Vermont and posted a 2.84 ERA in 6.1 innings. Blackwood is a submariner who can hit 93 on the radar gun.

To make room for Butler and Blackwood, the A's placed Andrew Tomasovich and Dustin Driver on the Beloit DL. 

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