Harper will miss at least one more game but could be cleared to return to action on Wednesday. The 20-year-old phenom has played just four games this month. Harper has only two hits in 18 plate appearances across those four games but has drawn five walks.
The Nats are 4-0 this month -- and have scored 24 runs over their past three games -- without the benefit of their two-time all-star's presence in the middle of the lineup.
Harper is hitting .273/.377/.504 with 19 home runs in 427 plate appearances. He has already drawn more walks this season (57) than he did in all 2012 (56).