Jackson has been limited by lower back stiffness early this spring and will undergo further tests, the team's web site reports.

EDGE Analysis

Jackson was converted into a relief role during the season last year in the minors, with Texas' bullpen depth from the right side providing the tougher hurdle to clear than what appears to be minor stiffness early this spring. He'll be hard-pressed to have much of a role this season.

Jackson was recalled from Triple-A Round Rock on Tuesday.

EDGE Analysis

Jackson has electric stuff, and opened the year as a top-200 prospect for dynasty leagues, but he was quickly converted to a reliever as his command failed him. He could eventually find himself in high-leverage spots, but that probably won't happen until 2016 at the earliest.

Jackson has been converted to a reliever at Triple-A Round Rock and has a 2.66 ERA, 1.27 WHIP and 32 strikeouts in 23.2 innings out of the bullpen. It just wasn't working out for him as a starter, as he posted a 5.64 ERA in five starts at the outset of the season. This may actually end up making him somewhat interesting in fantasy, as he was losing his luster as a starting pitching prospect. His 32:13 K:BB ratio in 23.2 innings shows the kind of bat-missing stuff he brings to the table as a reliever, indicating that he could someday be used in high-leverage situations at the big league level.