4. Jelena Ostapenko (6.19 doubles per match)
Ostapenko’s presence on this list makes sense, though her ranking might raise eyebrows. Many would expect her higher up given her reputation. Her style walks a tightrope between hyper-aggressive and almost nonchalant, which produces errors both in rallies and on serve. But here’s the thing: she’s never going to change, and she doesn’t need to. This approach has served her well enough, and she’s learned to strike a reasonable balance between risk and reward.
5. Kimberly Birrell (6.05 doubles per match)
Birrell plays with plenty of aggression and frequently hunts for big serves. The problem? She sometimes pushes too hard, leading to an inflated double fault count. Part of this reflects the modern game’s emphasis on power, but part of it stems from her technique not quite matching her ambitions. When you’re serving aggressively without an elite delivery to back it up, mistakes pile up quickly.
6. Marta Kostyuk (5.84)
Kostyuk brings real intensity to her serve despite not possessing overwhelming power. She plays to win every point rather than just stay in rallies, which inevitably means taking risks and making mistakes. Double faults become part of the equation, especially against top-tier opponents who force you to aim closer to the lines.
7. Camila Osorio (5.83)
Another aggressive player who wants to control points with her own racquet, Osorio faces a challenge that technique alone can’t solve: height. She lacks the stature to consistently hit the angles she’s visualizing, which translates to a high double fault rate. Sometimes it costs her matches, other times she manages to offset it with winners. It’s a constant balancing act.
