Jessica Pegula vs Marta Kostyuk, Tennis Picks

Every measurable signal in this matchup points the same direction. Pegula is ranked 5th in the world to Kostyuk's 10th, and the gap in ranking points, 5,760 to 3,910, reflects a meaningful difference in sustained performance across the season, not just a snapshot. Her career singles titles, 11 to 3, reinforce that edge over a long body of work. The market has priced that in, putting Pegula at a 63 percent no-vig win probability. As a cross-check, the signals behind the model line up with that read. The honest counterargument is that Kostyuk is 24 to Pegula's 32 and owns the height edge, and in a group-stage match where stakes may feel different, the younger player can be loose and aggressive. That is real, but nothing in the available facts suggests it overrides the structural gaps that favor Pegula.