A spot in the next round is at stake on Thursday, when Pierre Hugues Herbert goes up against Taylor Fritz in the Lyon (France) round of 16. Taylor Fritz is 5-5 across recent matches. Pierre Hugues Herbert is 2-8 across recent matches.
Taylor Fritz simply rates much higher on clay, and our number follows from it. Herbert comes in off a compressed schedule. Herbert needs several things to break right at once; the percentages say they usually don't.