Del Potro had arrived in London in the wake of an injury to his abdominal muscles ; he had started off a little quietly .
Was able to recover , winning a couple of matches to rebound and send out a strong signal .
Del Potro had arrived in London in the wake of an injury to his abdominal muscles ; he had started off a little quietly but was able to recover , winning a couple of matches to rebound and send out a strong signal .