A spot in the next round is at stake on Sunday, when Emiliana Arango goes up against Iga Swiatek in the Cincinnati round of 64. Iga Swiatek is rolling — 6 straight wins, 8 of 10 in recent play. Emiliana Arango has won 4 of the last 10.

Hold strength tells the story — 63.9% versus 57.8% on first-serve points in Swiatek's favor. Anything other than a Swiatek win would rank among the bigger surprises of the week.