World No. 831 Mariano Kestelboim is 30 and plays right-handed. The record here is almost entirely on clay: 2-6. Twelve-month serve numbers: 65.2% of first serves in, 62.9% of those points won. A real threat on return: 31.4% of break points are converted.

A difficult stretch: 4 of the last 5 matches lost. Open any of these matches for BananaCore's pick, a predicted scoreline and the serve and return figures behind them. Latest tournament on record: Challenger Lyon France Qualifying.

Serving and returning

1st serves in

62.5%

Won on 1st serve

63%

Won on 2nd serve

42.6%

Aces per match

1.9

Double faults per match

3.7

Break points saved

52.1%

Return games won

26.3%

Points won on return

38.7%

Service points won

55.3%

All points won

47.4%

Career Past 12 months

Titles

Finals

Semi-final runs

Tournaments played

Results by tournament

Santa Cruz, Bolivia Challenger Round of 32 Asuncion, Paraguay Challenger Round of 32

Cali, Colombia Challenger Round of 32

Lima 2, Peru Challenger Round of 32

Lima 3, Peru Challenger Round of 32 Tigre, Argentina Challenger Round of 32 Montevideo, Uruguay Challenger Qualifying Bad Rappenau, Germany Challenger Qualifying Concepcion, Chile Challenger Qualifying Campinas, Brazil Challenger Qualifying Costa do Sauipe, Brazil Challenger Qualifying Lyon, France Challenger Qualifying

Sorted by best result, not by date

Year by year

2026

2026in progress

2–7

W–L

Matches

1–0

Tiebreaks

2.2

Aces per match

3.6

Double faults per match

1st serves in 62.2%

Won on 1st serve 62%

Won on 2nd serve 45.8%

Break points converted 47.1%

Break points saved 54.5%

2025

22–17

W–L

Matches

2–3

Tiebreaks

1.4

Aces per match

2.8

Double faults per match

1st serves in 64.6%

Won on 1st serve 57.1%

Won on 2nd serve 44%

Break points converted 39.3%

Break points saved 53.9%

2024

16–12

W–L

Matches

4–5

Tiebreaks

1.4

Aces per match

2.3

Double faults per match

1st serves in 67.4%

Won on 1st serve 61.7%

Won on 2nd serve 49.4%

Break points converted 37.4%

Break points saved 57.7%

Official singles figures for this season, as published by the tour. Don't expect the wins and losses to match our Predictions tab: that record covers only the matches we forecast. A dash marks a figure with no data yet.