Although the Rockies have called up Josh Rutledge, who played shortstop last season when Tulowitzki was hurt, LeMahieu played shortstop every day at Triple-A Colorado Springs before coming up to play second base this season. Both LeMahieu and Rutledge have extensive professional experience at both middle infield positions, so the Rockies can use whatever middle infield deployment they (or the players) feel most comfortable with.

LeMahieu has put a slow start to June behind him to collect seven hits in 19 at-bats over his last seven games, giving him a .266 batting average in 79 at-bats this season.

Lemahieu is hitting .275 with a .356 on-base percentage, but he has only two extra-base hits in 40 at-bats, both doubles. LeMahieu has just a .409 career slugging percentage, including .411 in three seasons at the power-heavy Triple-A Pacific Coast League, so even with the effects of Coors Field, big power likely isn't coming.

LeMahieu has never hit below .314 in any of his five minor league campaigns (he has a .321 career minor league BA). In 306 major league at-bats, he has a .294 average. I wouldn't expect much in the way of power or speed from LeMahieu, but 20 doubles the rest of the way (assuming he gets regular at-bats) wouldn't be out of the question, and you can pretty much bank on the average to be there. 

In NL-only, he's a must-add. But I would consider adding him in formats as shallow as 15-team Roto leagues (at MI or UT), based on his promise in batting average. 

LeMahieu has started four of seven games since being called up May 16, and he is hitting .412 with two extra-base hits and two RBI in 17 at-bats. He will likely be the full-time starter at second base with Rutledge gone.