Re: Peak Kournikova v. Peak Vaidisova?
I'm not sure she's ever reached Final on any significant tournament .. Kournikova at least was in big Finals in singles and won trophies in doubles
Kournikova had a longer career. Nicole retired at such a young age so she didn't have the luxury of being a Tier I finalist. Though Nicole reached the semis of GSs and won 6 titles while Kournikova could only hoped for.
And for doubles, Kournikova won them with the help of Hingis and other doubles GOATs.