PERTH, Australia Jelena Jankovic said she could be risking her career by playing with a leg injury at the Hopman Cup.
Jankovic, who hurt her right thigh on Wednesday, was unable to complete her singles match on Thursday but returned for the mixed doubles later as Serbia beat Argentina 2-1 to set up a final meeting with United States on Friday.
The world number three sported heavy strapping on her thigh and although her movement appeared better than it was on Wednesday, she was still restricted.
"I shouldn't be here, I am really risking my career," Jankovic told the crowd after helping Novak Djokovic beat Gisela Dulko and Juan Ignacio Chela 6-1 3-6 7-6 in the doubles.
"It's a bit worse today and I shouldn't be playing but I love playing for my country and I will just try the best I can."
Jankovic won the first set of her singles contest with Dulko before quitting at 0-2 in the second.
"I'm having a hard time on the court," said Jankovic, who will take on former world number one Serena Williams in the singles on Friday.
"I don't know why I am still here, I really don't, but I want Serbia to win."
(Editing by Tony Jimenez)