Winfree found ways to strap the tank to her back in order to mow the grass and go biking.
That unfinished match, however, remained a source of motivation. Winfree was weeks shy of her 54th birthday when she had the transplant. She faced a long road back to Public Courts.
In the months after Winfree left the Cleveland hospital, local tennis pro Neil Rajapakse coerced her to return to the tennis court.
They hit together regularly, at first only short shots because Winfree couldn't muster the strength to hit groundstrokes over the net from the baseline.
They increased their time on the court together from 10-15 minutes to 30 minutes. Once a 4.0-rated player, Winfree started playing against 2.5 competition, then 3.0 and 3.5.
After 18 months back at 4.0, she called up Porter, a Williamson resident, and asked if she'd like to enter in this year's Public Courts Women's 55 division.
"Of course I was going to play," said Porter, who hadn't played much in the years since Winfree was sidelined.
"She's blessed to be back out here doing what she loves and she's sharing it with me. That's awesome."
Winfree and Porter followed up a win Saturday with a 6-3, 6-1 loss to Debby Berry and Kelli Hinkle on Sunday afternoon in 4.0 doubles. Those matches were a bonus to Winfree and Porter, who have yet to play in Women's 55 doubles.
Winfree doesn't lug the oxygen tank around anymore. She has surprised doctors with her lung capacity, which is in the 97th or 98th percentile. She no longer has to worry about coughing up blood during matches and trying to find a way to keep her struggles a secret on the court.
"They said I wouldn't live without the transplant," Winfree said. "So to me, just being able to play is important to me. I thought I would get back to somewhat of a normal life, but I never thought I'd get back to biking, hiking and playing tennis.
"I've always played a lot of sports, but tennis has been my passion."
Contact sports editor Chuck McGill at chuck.mcg...@dailymail.com or 304-348-7949. Follow him on Twitter @chuckmcgill.