Elise Mertens and Iga Swiatek meet in the quarterfinal at Beijing on Friday. Iga Swiatek is 8-2 across recent matches. Elise Mertens is 7-3 across recent matches.
Iga Swiatek simply rates much higher on hard, and our number follows from it. Mertens comes in off a compressed schedule; Swiatek comes in off a compressed schedule. Mertens needs several things to break right at once; the percentages say they usually don't.