Australian tennis great Todd Woodbridge says he's unsure how much longer Samantha Stosur will continue her career after her disappointing first-round exit from the Australian Open. 
Stosur lost in straight sets, 6-4, 7-6 (8-6), to qualifier Kristyna Pliskova on Monday night.
"I'm not sure how much longer she could play with that level because that would become frustrating when you've played at higher levels than what we saw," Woodbridge told SEN on Tuesday.
"I thought last night was a real disappointment."
She didn't play anywhere near to the level she is capable of."
It was the first time since 2012 Stosur has tumbled out of the tournament without winning a set.
Her best performances in Melbourne came in 2006 and 2010 when she made the fourth round.
Woodbridge said in previous years the pressure and expectation of her home grand slam may have weighed on Stosur, but Monday night's performance suggested bigger problems with her game.
"I thought this summer - I called every one of her matches in Brisbane, Sydney and last night - she just has not been hitting the ball very well," Woodbridge said.
"She's not playing as solid tennis as she was previously.
"She's [almost] 32 years of age and I wonder whether that now if her best tennis could be past her - that's quite a possibility."
Stosur, whose capitulation to Pliskova marked her fourth first-round exit from the Australian Open, spoke candidly post-match.
"[I'm] obviously really disappointed not to get through," she said. "I am not happy about it, that's for sure. Unfortunately it's another year done."
Stosur admitted she hoped that in retirement her performances at home would not overshadow her achievements overseas.
"Hopefully not from my Australian Open results," she said when asked how she thought she would be remembered as a player.
"I've had a really good career. I've achieved a lot of things.
"You know, winning a grand slam was my dream from when I was eight or nine years old, and I've been able to do that.
"There's been a lot of good in my career but I'd obviously like to do better here at the Open."
After losing the first set, Stosur recovered and had a set point on Pliskova's serve, but was unable to convert her chance.
"Look, I didn't play bad. I played a decent match," Stosur said.
"I played somebody who was playing well. Had a couple of opportunities and didn't take them.
"I felt pretty good coming into tonight's match. I did everything I thought as best as I could tonight, gave it everything, and unfortunately came up short."