What It Means:

The Rockies decided to put Anderson under the knife after two trips to the disabled list limited him to just two starts -- and only 3 1/3 innings -- this month. He's only expected to spend around four weeks on the shelf, so look for the 27-year-old left-hander to be back in the rotation by the beginning of August.

Anderson has struggled to a 6.11 ERA this season, but that's accompanied by a more acceptable 4.03 xFIP and 4.23 SIERA. He owns a 1.55 WHIP and 22.4 strikeout percentage while going 3-5 across 63 1/3 innings (12 starts).