Video: Tennis legend Billie Jean King sighted hitting on practice court at Roland Garros

Outside of the main draw matches, there was a still lot of action going on at Roland Garros (French Open) this week, as WTA great Billie Jean King was spotted warming up on the practice courts this week.

The retired American has been a permanent fixture at every Grand Slam each year, and made the trip to Paris for her annual tradition. A former World No.1 and trailblazer for women's tennis, King lifted the trophy in 1972 in both singles and doubles.

King took to social media on Tuesday to post footage of herself hitting some volleys on the practice court, and the 79-year old looked impressive as she reached down to hit a few low volleys.

"Hitting on a practice court @rolandgarros," she tweeted. "Terrific to hit on clay again. It's been awhile!"