(S (S (S (VP (ADVP (RB Currently)) (VP (VP (VBN ranked) (ADVP (RB 23rd))) (PP (IN in) (BASENP (DT the) (NN world)))))) (COMMA ,) (S (BASENP (PRP she)) (VP (VP (VBD entered) (BASENP (DT the) (NN tournament))) (PP (IN in) (NP (BASENP (DT the) (NN shadow)) (PP (IN of) (NP (BASENP (PRPD her) (NN sister)) (COMMA ,) (BASENP (NNP Serena) (NNP Williams))))))))) (PERIOD .))