[2] He made two appearances for the rookie–level Gulf Coast League Red Sox in 2008 as he continued his recovery from surgery.
[3] Clay spent the 2010 campaign with the High–A Salem Red Sox, compiling a 4–13 record and 4.57 ERA with 67 strikeouts over 26 appearances (25 starts).
[4] In 2011, Clay played for the Double–A Portland Sea Dogs, making 28 appearances and struggling a 7.47 ERA with 53 strikeouts in 59 innings.
In 27 games (26 starts) split between the Double–A Harrisburg Senators and Triple–A Syracuse Chiefs, Clay accumulated an 11–5 record and 2.96 ERA with 110 strikeouts across 158+1⁄3 innings pitched.
On November 10, 2013, Clay signed a minor league contract with the San Francisco Giants organization.
In 22 games (20 starts) for Reno, Clay logged an 8–7 record and 5.25 ERA with 56 strikeouts across 111+1⁄3 innings pitched.