Rasner began his major league career with the Washington Nationals, pitching in a few games late in the 2005 season.

[4] On May 19, 2007, in a start against the New York Mets, Rasner was struck on the right hand by a ball hit by Endy Chávez, a former teammate with the Nationals.

Rasner worked six innings, allowing only two runs and stayed in the Yankee rotation until September, when he was replaced by Alfredo Aceves.

[9][10] He played with the Golden Eagles for five years (2009-2013), the last three as a closer and setup man, before going down with an elbow injury that required Tommy John surgery.

[11][12] He won the 2013 Japan Series championship as a member of the Rakuten Golden Eagles with former Yankees Andruw Jones and Casey McGehee.