Friday's Montreux quarterfinal pits Dalma Galfi against Simona Waltert on clay. Simona Waltert has won 4 of the last 10. Dalma Galfi is 3-7 across recent matches.
There's a wide gap in our ratings on clay, and our number follows from it. Waltert is running on fumes after a brutal stretch of scheduling. A tiebreak or two would surprise nobody, with Waltert fractionally more likely to land the big points.