Britain's Jordanne Whiley says "player and tournament sponsorship" is the key to developing wheelchair tennis.

The 28-year-old also revealed that her fourth Paralympics in Toyko next summer would be her last.

"There is a big gap in the earnings of Grand Slam players and those on the ITF tour," Whiley told BBC Radio 4.

Asked if wheelchair tennis players could earn enough money for a career, Whiley said: "Absolutely, if you are competing at the Grand Slams consistently.

"There are 20 people who are full time and making a decent living and that is where I think it needs to change so more people can do that."

However, the Birmingham-born player said the tournament organisers at the US Open "did a really great job".

"We have each had our own private suite with food and drink on demand," she added. "Everything has been spotless and everyone is abiding by the rules. I cannot fault it."

The 12-time Grand Slam winner also confirmed next summer's Tokyo Paralympics would be her final event because of her desire "to expand our family".

"I have done this for 20-odd years of my life and I think it's time for a new chapter," she said.