The Washington Nationals added former Wabash Valley College pitcher Aaron Barrett to their 40-man roster Wednesday.

Barrett, 25, a ninth-round pick in 2010, had a 2.15 ERA at Class AA Harrisburg of the Eastern League, where he struck out 69 and walked 15 in 51 appearances with the Senators.

The righthanded reliever’s low 90s fastball and slider was rated as the best in the Nationals system, according to Baseball America.

Published reports out of Washington indicate that while the Nats seem to have enough relief pitching on their roster, they felt Barrett’s potential was good enough to protect him from other teams in the Rule 5 draft. That deadline was Wednesday at midnight.

Barrett, who was born in Evansville, pitched at Mississippi after one season at WVC.

• Keith Butler, the 24-year-old former Warrior righthander drafted in the 24th round by the Cardinals in 2009, saw his first major league action last season.

After being called up June 1, he threw 20 innings of relief ball in 16 outings with the Redbirds, with an ERA of 4.05.

Butler struck out 16 and walked 11, allowing nine earned runs. He was assigned to Triple-A Memphis late in the season, but is still on the Cardinals’ 40-man roster.

Wednesday, the Cardinals made three  additions to that roster: infielder Greg Garcia and outfielders Oscar Taveras and Mike O’Neill.

Outrighted, or removed from the 40-man roster were LHP John Gast, 3B Jermaine Curtis and SS Ryan Jackson, who was subsequently claimed by Houston.

• Ross Wolf has been signed as a free agent by the Texas Rangers, the team he pitched for last season.

Wolf, who pitched 72.2 innings of relief in 22 appearances for the Rangers, was declared a free agent on Nov. 5, the day before the Rangers resigned him.

He was first inked by the Rangers in 2012 after his release by Baltimore.

During his 13-year baseball career, Wolf has also been in the Montreal, Florida, Oakland and Houston organizations.

The 31-year-old Newton native, a 6-foot righthander, was drafted out of WVC by the Marlins in the 18th round of the 2002 amateur draft.

Wolf has pitched in three seasons in the major leagues, with Florida in 2007, and Oakland in 2010 prior to last year with the Rangers.

He is not listed curretly on Texas’ 40-man roster.