Watch out Diana Taurasi, there's another G.W.O.A.T in town -- so says Vivica A. Fox, who tells TMZ Sports Candace Parker should absolutely be in the conversation of being WNBA's best ever.
The Phoenix Mercury superstar was voted the greatest (by fans) before Game 1 of the WNBA Finals last week ... and four games later, lost the championship to Parker and the Chicago Sky.
Fox -- a HUGE hoops fan -- kept a close eye on the series, of course ... so we had to ask for her take on the end result.