Justine Henin Pictures

Justine Henin, who was ranked the world's No. 1 player last year, is set to announce a return to women's professional tennis later today. Back in May she complained about how the sport left her with various physical ailments, and noted that she did not think a return was possible. In the past month she began to train again, but hasn't commented on plans of a return to the sport.Henin, 27, is