Mariano Kestelboim is a 30-year-old right-handed professional tennis player, currently ranked world No. 831. Over the last 52 weeks the serve has landed 65.4% of first deliveries, winning 61.8% of those points. Breaking is the real weapon here: 31.3% of break chances get taken. Almost the entire record comes from one surface, clay (2-6).

Lately it has not been coming together — 4 defeats in the last 5 outings. Predictions cover match winner and score, alongside serve, return and break-point statistics. Most recently seen in our data at Challenger Lyon France Qualifying.

Serve & Return

First Serve %

62.5%

1st Serve Won

63%

2nd Serve Won

42.6%

Aces / Match

1.9

Double Faults / Match

3.7

Break Pts Saved

52.1%

Break Pts Converted

26.3%

Return Pts Won

38.7%

Service Hold %

55.3%

Total Pts Won

47.4%

Records Last 12 months

Titles

Finals

Semis or better

Events played

Tournament Results

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

Deepest runs first, not by date

Season by season

2026

2026so far

2–7

Won-lost

Matches

1–0

Tiebreaks

2.2

Aces / Match

3.6

Double Faults / Match

First Serve % 62.2%

1st Serve Won 62%

2nd Serve Won 45.8%

Break points won 47.1%

Break Pts Saved 54.5%

2025

22–17

Won-lost

Matches

2–3

Tiebreaks

1.4

Aces / Match

2.8

Double Faults / Match

First Serve % 64.6%

1st Serve Won 57.1%

2nd Serve Won 44%

Break points won 39.3%

Break Pts Saved 53.9%

2024

16–12

Won-lost

Matches

4–5

Tiebreaks

1.4

Aces / Match

2.3

Double Faults / Match

First Serve % 67.4%

1st Serve Won 61.7%

2nd Serve Won 49.4%

Break points won 37.4%

Break Pts Saved 57.7%

Season totals from the tour feed, singles only. The won-lost line is the tour's own count and can differ from the record under Predictions, which counts the matches we cover. A dash means the season holds nothing to measure that figure from.