Friday's Hamburg quarterfinal pits Alina Charaeva against Anna Bondar on clay. Anna Bondar comes in at 5 wins from the last ten. Alina Charaeva has won 7 of the last 10.

The two have never played — a first meeting always adds a layer of uncertainty the numbers can't fully capture.

There's a wide gap in our ratings on clay, and our number follows from it. Expect resistance, but the match-level math tilts clearly toward Bondar.