Owned in two percent of leagues, Hembree -- who has a 2.56 ERA, 1.09 WHIP and 11.6 K/9 in more than 218 minor-league appearances -- doesn't merit consideration outside of deeper Dynasty leagues but is worth keeping an eye on into the summer, as a call-up gets him in the bullpen and some kind of Sergio Romo catastrophe (or even a deadline deal to a rebuilding team like Houston) could vault him into the saves mix. There's a lot of speculation there, but Hembree has shown he has the talent to get batters out and can thrive in a late-game situation. 

Hembree has opened the season at Triple-A Fresno with three scoreless innings. In his career, he is 2-2 with a 2.61 ERA and 1.12 WHIP in 113 relief appearances. He is also striking out 11.7 batters per nine innings and has recorded 58 career saves in 110 1/3 innings.

Hembree is considered the Giants' fifth-best prospect by MLB.com.

Hembree and Kieschnick, although lesser-known, could find their way to San Francisco sooner. Hembree struggled a little in 2012 as he jumped from High-A to Triple-A and battled an elbow strain, but his 4.19 ERA belied a solid 1.16 WHIP, and he struck out a batter per inning. Although there's little room for him in the closer mix at the major-league level, Hembree, who throws in the mid-90s, could eventually join the bullpen as a low-ratio, high-strikeout middle reliever.

Kieschnick is a big-swinging outfielder who hit .295 with 15 home runs in 234 at-bats last year. He missed three months after fracturing his left shoulder against an outfield wall trying to make a catch on a home run. With the Giants probably juggling Gregor Blanco and Andres Torres in left this season, it's not unlikely to think if they're hurting for runs, and Kieschnick gets off to a hot start, he could get the call. This is pure deep-league talk, but if I'm picking an NL-only reserve (or even a dynasty league reserve), I'd probably go for Kieschnick first out of these three players.