Bob, looking for rent money, runs into a lovely young woman running a bank errand for her promoter father. Because of the run-in, she doesn't get to the bank before it closes, and Bob gallantly agrees to see her and her money safely home. At home, the father is concerned that he'll have to return the money, because he's not able to field an American tennis champion for a match against Blobonia. So Bob volunteers to come out of his "championship" retirement for the offered $10,000.
Princess Ileana of Blobonia decides to take the situation into her own hands. Tracking Bob down during a training run, she whisks him away to a mountain lodge, and turns him over to her agents. All would be lost if not for Bob's persistant landlady who tracks him down, rescues him, and frees the American tennis champion for the new match.