Ayumi Koshiishi vs Giselle Isabella Guillen Head-to-Head Stats, Results & Performance Comparison

• Second serve performance: Recently, Ayumi Koshiishi has outperformed Giselle Isabella Guillen by winning 36.64% of points on her second serve compared to Guillen's 31.40%. Why is second serve performance crucial? It often predicts match outcomes.
• Return game comparison: Koshiishi has a slight edge in returning second serves at 48.34%, while Guillen follows closely with 46.85%. Both have nearly identical stats on first serve returns, at 35.00% and 34.55%, respectively. Consistent return performance can be key in head-to-head matchups.
• Pressure handling: Under pressure, Guillen shows stronger breakpoint saving at 50.00%, outshining Koshiishi's 42.59%. Breakpoint conversion is often critical for in-game dynamics.
• Match performance: Over the past year, Koshiishi achieved a 50.77% win rate, contrasting with Guillen's impressive 66.67% win rate. Does a higher win rate suggest better form? It often indicates greater consistency.
• Surface preference: Both players excel on hard courts, boasting a 64% win rate. Koshiishi struggles more on indoor hard surfaces, with a 55% win rate, compared to Guillen's dip on grass.
• Event level and player exposure: Koshiishi has competed mostly in Challenger/ITF events, reflecting a balanced win rate. Guillen, however, played primarily in Futures events and maintained a perfect win record. Does playing in different event levels affect predictions? It often impacts skill evaluation relative to opposition quality.
• Opponent quality: Koshiishi faced slightly tougher opponents with an average ranking of 422.97, whereas Guillen's opponents averaged a 475.5 rank. How crucial is opponent quality? It affects match readiness and competitive exposure.
• Deciding set prowess: In deciding sets, Koshiishi has a 63% win rate, while Guillen boasts an unbeaten record. Could this factor tilt the match if it goes to a final set? Yes, prior success in deciding sets builds confidence.
• Breakpoint conversion: Guillen edges ahead with a 43.75% conversion rate of breakpoints, compared to Koshiishi's 38.34%. Breakpoint opportunities can be pivotal in turning the match around.

Editorial Prediction (November 16, 2025, UTC):

This tennis matchup promises to be intriguing with both Ayumi Koshiishi and Giselle Isabella Guillen bringing their strengths to the court.

Koshiishi excels in second serve performance and return games, which often aligns with match success. However, Guillen's ability to save breakpoints and her unbeaten record in deciding sets indicates she handles pressure exceptionally well.

Both players have a favorable win rate on hard courts, their preferred surface, but Guillen's superior overall match win record and perfect performance in Futures events give her an edge.

Ultimately, Giselle Isabella Guillen appears more likely to emerge victorious, thanks to her robust form, breakpoint saving ability, and strong performance under pressure.