Pedro Strop expects to miss "at least a couple weeks" after injuring his hamstring while running to first base in the 10th inning of the Cubs win over the Nationals on Thursday, according to Paul Sullivan of the Chicago Tribune.
Strop entered the game with one out in the bottom of the eighth inning and the score tied, 3-3. He pitched 1 2/3 scoreless inning to push the contest into extras.
In the top of the 10th, Chicago grabbed a 4-3 advantage when Javier Baez bunted in Kris Bryant with one out.