Original sentence: On May 6, 2007, citing injuries, Clijsters announced on her official website that she is retiring immediately from professional tennis, concluding a career highlighted by her 2005 U.This was Clijsters's last professional match
Edited sentence: On May 6, 2007, citing injuries, Clijsters announced on her official website that she is retiring immediately from professional tennis, concluding an outstanding career highlighted by her 2005 U.This was to be Clijsters' last professional match