Li Na moved to the brink of another first when she scored her second win of the week at the WTA Championships with a 6-3, 2-6, 6-3 win over Jelena Jankovic on Thursday.
Li is already the first Chinese singles player to have won a Grand Slam title and to have reached the world's top five.
Now she is within touching distance of being the first to qualify for the semi-finals in the tour's flagship tournament.
It was a topsy-turvy match, with Li having three points for a 4-2 lead in the second set, before losing five games in a row and then also letting slip her break of serve advantage in the final set to be pegged back to 3-3.
However, she was the more forceful player off the ground, and now if other results go right for Li she may qualify irrespective of the outcome of her last group match on Friday, a repeat of the Australian Open final against Victoria Azarenka.