Blair began the season at Double-A Midland and hit .272 with six home runs and 29 RBI in 55 games with the RockHounds before he was moved up to Nashville July 1. He batted .221 in 33 games with the Sounds and combined for a .252 average with nine home runs and 37 RBI in 88 games overall. The 25-year-old right-handed hitter will be making his Major League debut. Blair was originally drafted by Boston in the 35th round of the 2008 draft and was a non-roster invitee with the A's this spring after signing a minor league deal following the 2014 season.
Dull will be making his ML debut. He began the season with Midland and was 3-1 with 12 saves, a 0.60 ERA and .182 opponents batting average in 35 relief appearances. Dull was promoted to Nashville July 28 and was 0-1 with a 1.13 ERA and .172 opponents average in 12 relief appearances for the Sounds. The 25-year-old right-hander combined for a 3-2 record, 12 saves and a 0.74 ERA in 47 relief appearances between Midland and Nashville overall.
Ladendorf was on the A's Opening Day roster and went 2-for-10 (.200) with two RBI in four games before he was optioned to Nashville April 12. He hit .364 in six games with the Sounds before going on the disabled list April 21 with a sprained left ankle. The 27-year-old right-handed hitter was added to the Oakland disabled list May 22 and was reinstated and optioned to Nashville Aug. 20. He batted .265 in 20 games overall with the Sounds.
Leon was 0-1 with a 5.68 ERA in nine relief appearances in his first five stints with the A's this year. He allowed four runs in two games during his last stint from Aug. 3-14. Leon is 2-5 with a 2.95 ERA in 20 games, including six starts, for Nashville this year. He was 1-0 with a 1.50 ERA for the Sounds following his Aug. 14 option.
Martin was on the Atlanta Braves Opening Day roster and went 2-3 with a 5.40 ERA in 21 relief appearances over two stints in his Major League debut. He was also 1-3 with a save, a 2.10 ERA and .198 opponents average in seven games, six starts, with Triple-A Gwinnett before he was traded traded to the A's July 2 for international bonus slot 53. The 25-year-old right-hander went 3-4 with a 5.33 ERA and .267 opponents average in 10 games, all starts, with Nashville and combined for a 4-7 record and a 4.08 ERA in 17 games overall at Triple-A.
Otero joins the A's for the fourth time this year and is 2-4 with a 7.68 ERA in 30 games. He appeared in one game during his last stint from Aug. 15-22, allowing eight hits and eight runs in 1.1 innings on Aug. 16 at Baltimore. Otero was 1-0 with a 7.20 ERA in three relief appearances for Nashville following his Aug. 22 option and 2-0 with a 1.95 ERA in 15 games, two starts, for the Sounds overall.
Pridie was batting .310 with 20 home runs and 89 RBI in 127 games with Nashville. He added 55 walks for a .380 on-base percentage and also stole 20 bases. The 31-year-old left-handed hitter ranked second in the Pacific Coast League in runs (84), third in hits (148) and total bases (246), fourth in games and at bats (478), tied for fourth in triples (7), fifth in RBI, tied for eighth in home runs and walks and ninth in batting, slugging (.515) and extra base hits (51). Pridie is a .225 career hitter with five home runs and 24 RBI in 127 career games with Minnesota (2008-09), New York-NL (2011), Philadelphia (2012), Baltimore (2013) and Colorado (2014).
Hahn was 6-6 with a 3.35 ERA in 16 starts with the A's before he was placed on the disabled list July 11 retroactive to July 6 with a strained right forearm. Griffin began the season on the disabled list recovering from Tommy John surgery, was reinstated an optioned to Nashville June 13 and was placed on the Sounds DL June 20 with a strained right shoulder. Castro has spent most of the season with Nashville, compiling a 2-1 record, six saves and a 3.32 ERA in 35 games. He also went 0-1 with a 2.25 ERA in five relief appearances with the A's.