Venus Williams' Tennis End Is Near

Venus Williams has set a target for the end of her tennis career -- hoping to hang 'em up for good after one last shot at Olympic glory ... (apparently 4 gold medals isn't enough!).

The 36-year-old tennis superstar appeared on 'Home & Family' on the Hallmark Channel (airs Tuesday morning) ... and was asked if she's thought about retirement.

"I'm kinda targeting the next Olympics (Tokyo 2020) and that's in what 3-and-half years ... and I'm not counting!"

Williams says she's played a long time -- she turned pro in 1994 -- and still loves competing but says it's time for her to "get a life outside the court."