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J. Riera vs S. Sierra prediction

AI prediction

Probability for members

The model has S. Sierra winning this match. Create a free account to see with what probability, and the most likely set score.

Predicted winner
S. Sierra
Probability
Members only
Likely score
Members only
See the probability and scoreFree during the beta

Every prediction is computed before the match and never edited afterwards: the model's real accuracy is published match by match.

Women's ChallengerCuritiba (Brazil) - QualificationQuarter-final
J. Riera
J. Riera
vs
S. Sierra
S. Sierra

Community · Who wins?

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Form and record before the match

Last 10 matches, oldest to most recent

J. Riera
  1. L
  2. L
  3. W
  4. W
  5. L
  6. L
  7. L
  8. W
  9. L
  10. W
S. Sierra
  1. L
  2. L
  3. L
  4. L
  5. L
  6. W
  7. L
  8. L
  9. W
  10. W
4 – 6
Wins – losses
3 – 7
9 – 14
Sets won – lost
8 – 16
1 win
Current streak
2 wins
17-13 (57%)
2026 record
23-24 (49%)

ATP, WTA and Challenger singles matches played since 2020 by J. Riera and S. Sierra, before this match.

Recent matches

J. Riera's last five matches

S. Sierra's last five matches

Head-to-head since 2020

No direct meeting since 2020 on the ATP, WTA and Challenger tours.

Road through the tournament

To reach this round, J. Riera beat R. Masarova (1-6 6-4 6-1). To reach this round, S. Sierra beat J. M. Gonzalez Daniele (6-3 6-1), then G. Ce (7-6 3-6 6-4).

Key numbers

In tie-breaks, J. Riera wins 37 % (11 of 30), S. Sierra 58 % (18 of 31). In deciding sets, J. Riera wins 44 % of the time (54 matches), S. Sierra 62 % (39 matches). After losing the first set, J. Riera turned 23 % of matches around (69 occasions), S. Sierra 22 % (68 occasions). After winning the first set, J. Riera went on to win 83 % of matches, S. Sierra 93 %.

Completed ATP, WTA and Challenger singles matches since 2020, before this match, retirements and walkovers excluded.

Frequently asked questions about J. Riera – S. Sierra

Who is the favourite between J. Riera and S. Sierra?
No bookmaker odds are available for this match. Pronocast's model has S. Sierra winning. The win probability and most likely score are for members before the match.
When is the J. Riera – S. Sierra match?
On Friday, 30 October 2026 at 15:00, at the Curitiba (Brazil) - Qualification tournament (Quarter-final, Unknown).
What is the head-to-head between J. Riera and S. Sierra?
No meeting between J. Riera and S. Sierra appears since 2020 on the ATP, WTA and Challenger tours.
Where can I see the prediction for J. Riera – S. Sierra?
In the Pronocast app, for members: probability of winning, most likely score and comparison with the odds. It will be published on this page with the result once the match is over.

How the model computes its predictions

Same tournament: Curitiba (Brazil) - Qualification

Tournament page

Other matches on 30 October 2026

All matches on 30 October 2026