Bryce Harper and Mike Trout Are Up, How Long Until We See Cubs' Anthony Rizzo?

The Washington Nationals and Los Angeles Angels of Anaheim both called up their top prospects this weekend, and Bryce Harper and Mike Trout have already proved to be valuable additions to their respective squads.

The Chicago Cubs have a big-name prospect of their own, and he is absolutely raking in Triple-A Iowa.

Anthony Rizzo, acquired in the offseason for Andrew Cashner, owns a line of .378/.427/./671 in 82 at-bats this season. He has launched seven home runs and compiled 21 RBI.

His ridiculous 2011 season in Tucson (.331/.404/.652, 26, 101) earned him a midseason call-up for the Padres, but he disappointed a bit in limited action.

In 128 at-bats, Rizzo hit just .141/.281/.242 with one home run and nine RBI.

Those numbers are likely part of the reason why the Cubs have yet to promote their slugging first baseman, as is the production of their current first baseman, Bryan LaHair.

If the Cubs are desperate enough for offense, they could easily to a little shifting to make room for Rizzo.

LaHair, who can also play a little outfield, could shift to right field. This would move David DeJesus to center, which would demote Reed Johnson to the fourth outfielder's role.

Johnson could find himself back in a starting role if the team unloads Alfonso Soriano, but that seems unlikely at this point.

Currently, the Cubs are 7-14 and sitting in last place in the competitive NL Central.

They seemingly has no hopes of competing in 2012, so they may choose to leave Rizzo and fellow top prospect Brett Jackson down in Triple-A for the rest of the season.

If we see Rizzo or Jackson at all in 2012, it'll likely be as September call-ups.