Answer
Diyas' winning percentage in the Fed Cup is much better than Shvedova's. Diyas has won 64.7% of her matches, while Shvedova has won only 47.4%. This difference is likely due to the fact that Diyas has played in more Fed Cup matches than Shvedova. Diyas has played in 22 Fed Cup matches, while Shvedova has played in only 19.