I was thinking maybe Goerges? Lefty and a good doubles player. Also, they seemed to have a great rapport in that long first round Wimbledon match.
Edit: actually she's righthanded. Mixed her up with Kvitova.
Kveta and Kata can be the number 1 team, they just seem to lack the focus to do it.
We don't know that. I think they are the best team that does only doubles, but come up short against teams of top singles players who also know how to play doubles. Kata needs to look for a top singles player with doubles experience, who complements her game.