It's official: Stephen Strasburg will make his first rehabilitation start on Sunday. Strasburg will pitch for Single-A Hagerstown at 4:05 p.m., his first real game since undergoing Tommy John surgery last September. Adam Kilgore of the Washington Post has the details.

Stephen Strasburg threw a side session without issue this afternoon, which allowed the Nationals to finalize the date of his first minor league rehab start in his recovery from Tommy John surgery. Strasburg will start Sunday at Class A Hagerstown, the most significant milestone yet as he nears a return to the major leagues. First pitch is 4:05 p.m.

The Nationals' minor league affiliates' seasons end in early September, which should give Strasburg the chance to return to the majors if all goes well. It remains unclear when that first start would be, but early September seems like a good guess.

For more on Strasburg's return and the Nationals, visit Federal Baseball.