Are you trying to find the best place on your fantasy baseball team to roster a high upside guy whom you can get without much expense in a 10 team mixed league? My answer to you is to look immediately to the outfield. The reason is because of the sheer amount of outfielders used in just about every form of fantasy baseball. This results in relatively less risk when compared to clogging your team up with too many first basemen or shortstops for example.
Ben Francisco Phi-OF
With the injury to Domonic Brown, Francisco is getting everyday playing time in right field. So far so good. He's batting .275 with 2 homeruns to go along with 7 runs and 8 RBI early in the season. Barring a huge slump Francisco should be able to maintain his current role as a starter as Dominic Brown will go to the minors for a while before being called up in order to get his timing down following the aforementioned injury.
Mike Morse Was-OF/1B
Morse's value is obvious seeing how he hit 15 homeruns in only 266 at-bats in 2010. Of those 15 homeruns, 11 came after the all-star break. Morse also had a stellar spring hitting .364 with 9 homeruns. Early into the 2011 season Morse is struggling at the plate and could easily slump his way into a platoon. However, with Morse's potential as a power hitter in his prime at age 29 he is a guy you should stash for now, and not give up on just yet.
Desmond Jennings TB-OF
Jennings is the obvious heir to Carl Crawford in Tampa. Manny Ramirez and Johnny Damon were brought in to help with this transition which (with Manny's sudden departure) is almost assured to come this summer. Jennings is a monster on the basepaths having swiped 52 bases between AA Montgomery and AAA Durham in 2009 followed by 37 with AAA Durham and 2 with the major league squad in 2010.
Peter Bourjos LAA-OF
Bourjos has won the starting center field job because of his defensive abilities. Obviously he isn't on this list for those reasons. He is on this list for his speed. Bourjos has the potential to steal 30 bases if he can get on base enough. His inability to get on base (.237 OBP in 181 AB in 2010) really hurts his value in H2H leagues as does his K/BB ratio. In his 181 AB in the bigs last season he struck out 40 times while only walking 6 times. He does have some power potential as long as he makes contact, but his value is definitely his speed.
Lorenzo Cain KC-OF
Cain is another guy who is expected to join the big league roster some point this summer. Cain plays great defense which should help him unseat Melky Cabrera in center field. If you find yourself looking for speed at that point in the season consider Cain before all of your opponents do. During a late season stint in the majors last season with the Brewers, Cain hit .306 with 7 SB in 147 AB. He had 26 stolen bases in the minors during the 2010 season between AA Huntsville and AAA Nashville.