Derek Jeter took batting practice outside yesterday for the first time in his latest comeback from a broken left ankle.

The shortstop took 21 swings at the Yankees’ minor league complex in Tampa, where he has been rehabbing after doctors discovered a second fracture in the ankle following the initial injury suffered during the ALCS last year.

He was able to hit balls to all fields, but the Yankees are still going to have Jeter come along slowly, in hopes of avoiding another setback.

After getting clearance for increased baseball activity last week, Jeter also has begun moving more on ground balls at short, but Joe Girardi said he was unaware when Jeter would be able to begin running the bases — which is when he had issues in his first rehab.

Jayson Nix and Reid Brignac continue to fill in for Jeter in The Bronx.

* Alex Rodriguez’s attorney blasted MLB’s investigation involving players’ potential connection to Biogenesis and performance enhancing drugs, according to USA Today.

David Cornwell, who also represents Francisco Cervelli, called information gathered by paying witnesses like Biogenesis founder Anthony Bosch “irreparably tainted” because of accusations of “paying for evidence. Offering to pay for evidence. Intimidating witnesses.”

Cornwell accused baseball of “unethical and potentially illegal” behavior.

MLB executive vice president Rob Manfred responded by saying baseball stands by its actions.

“At the conclusion of this investigation we hope that there will be a full airing of what we have learned about what Mr. Cornwell and his clients have done, so that the public can decide who has behaved despicably, unethically and illegally,’’ Manfred told USA Today.

Girardi declined comment regarding the investigation.