Friday's US Open semifinal pits Coco Gauff against Elena Rybakina on hard. Elena Rybakina is rolling — 9 straight wins, 9 of 10 in recent play. Coco Gauff has won 10 in a row and 10 of the last 10 overall.
Rybakina's 70% behind the first serve (against 65.8% for Gauff) means break chances should be scarce in one direction. The edge belongs to Rybakina — real, but not the kind you take for granted at this level.