WASHINGTON -- Nationals Minor Leauge right-hander Drew Storen is an inch closer to the big leagues. He learned on Sunday that he's been promoted from Class A Hagerstown to Class A Advanced Potomac.

Storen, who was drafted in the first round of the 2009 First-Year Player Draft, is clearly the best reliever in Washington's farm system.

Entering Sunday's action, Storen had a 3.68 ERA, 26 strikeouts in 14 2/3 innings and no walks. Even more impressive, in his past five outings, Storen hasn't allowed an earned run in 6 2/3 innings. He also has 15 strikeouts over that span.

On Saturday, acting general manager Mike Rizzo talked about the possibility of promoting Storen.

"There is a possibility [he could be promoted]. I'm not sure," Rizzo said. "Like I said before, you really have to master the league before we move you up, but he is leaning toward really make it tough [when it comes to staying in Hagerstown] ."

Storen mastered the South Atlantic League and hopes to be in the big leagues before the season is over.

"I'm still taking the same approach. I really don't think about it too much [when it comes to the big leagues]," Storen said on Saturday. "I'm going to stick to my game. If they feel like it could help them win, they will get me up there. That's something I want to do."