Wednesday's US Open quarterfinal pits Elena Rybakina against Qinwen Zheng on hard. Elena Rybakina is rolling — 8 straight wins, 9 of 10 in recent play. Qinwen Zheng is rolling — 4 straight wins, 6 of 10 in recent play.
Elena Rybakina simply rates much higher on hard, and our number follows from it. Anything other than a Rybakina win would rank among the bigger surprises of the week.