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Tennis · Curitiba · Brazil · clay

Riera J. vs Sierra S.

Friday, 30 October 2026

Upcoming. The scheduled start is still ahead. Match status has not been confirmed live.

Match preview

The model gives Riera J. a 57% chance on clay. That rests on 9 wins from the last 10 matches on clay to 7. Sierra S. is the higher-ranked player (No. 101 against No. 140), so the model is leaning on form rather than ranking.

Key facts

  • They last met on 30 Apr 2023, when Riera J. won 2-1.
Brazil•Challenger•Curitiba•clay
Riera J.
Riera J.
Age 24 · Rank #140
VS
Sierra S.
Age 22 · Rank #101
Sierra S.
Friday, 30 October 2026 at 17:00
Upcoming. The scheduled start is still ahead. Match status has not been confirmed live.
Model win probability
Riera J.Sierra S.
57%
43%
Riera J. · all surfaces (latest first)
W0d
W2d
L29d
W31d
L37d
L44d
L48d
W49d
W50d
L65d
2-match win streak · all at Curitiba — built in this tournament
On clay9–1 · 90%· won 1+ set 10/10
W0d
W2d
W95d
W96d
W97d
W98d
W99d
L104d
W105d
W107d
7-match win streak · 2 at Curitiba · 5 at other events (W75 Vacaria)
Sierra S. · all surfaces (latest first)
W1d
W2d
L36d
L42d
W43d
L59d
L78d
L86d
L93d
L120d
2-match win streak · all at Curitiba — built in this tournament
On clay7–3 · 70%· won 1+ set 8/10
W1d
W2d
L153d
W155d
W158d
L168d
W169d
W170d
L173d
W175d
2-match win streak · all at Curitiba — built in this tournament
Recent form
Riera J. · all surfacesSierra S. · all surfaces
1010
5/103/10
5/107/10
50%30%
3/101/10
5/105/10
5/105/10
2/104/10
10 / 128 / 16
-2-8
On clay (this match's surface)
Riera J. · last 10 on claySierra S. · last 10 on clay
1010
9/107/10
1/103/10
90%70%
6/104/10
0/102/10
10/108/10
4/104/10
19 / 515 / 9
+14+6
Head-to-head
3/63/6
02
6 meetings · 4 went to a deciding set
Market Odds
Bookmaker odds not available for this match.
Model Prediction
Riera J.
57%
Sierra S.
43%
medium confidenceData 70%clay6 H2H used
◀ Riera J.Why the model leansSierra S. ▶
Ranking
-0.14
Surface
0.00
Form
+0.24
H2H
0.00
Model v2.3-2026-06
Riera J. Form
Riera J.
29 Oct2026
Riera J.WTA #140 vs Kabbaj Y.WTA #255
2-0W
27 Oct2026
Riera J.WTA #140 vs Masarova R.WTA #158
2-1W
30 Sept2026
Ruzic A.WTA #84 vs Riera J.WTA #140
2-0L
28 Sept2026
Riera J.WTA #140 vs Siskova A.WTA #172
2-0W
22 Sept2026
Micic E.WTA #289 vs Riera J.WTA #140
2-0L
15 Sept2026
Riera J.WTA #140 vs Avanesyan E.WTA #145
0-2L
11 Sept2026
Riera J.WTA #140 vs Blinkova A.WTA #73
0-2L
10 Sept2026
Riera J.WTA #140 vs Stoiana M.WTA #113
2-1W
09 Sept2026
Salkova D.WTA #108 vs Riera J.WTA #140
0-2W
25 Aug2026
Hruncakova V.WTA #220 vs Riera J.WTA #140
2-0L
Sierra S. Form
Sierra S.
28 Oct2026
ce G.WTA #346 vs Sierra S.WTA #101
1-2W
27 Oct2026
Gonzalez Daniele J. M.WTA #421 vs Sierra S.WTA #101
0-2W
23 Sept2026
Sierra S.WTA #101 vs Dilek D.WTA #549
0-2L
17 Sept2026
Lamens S.WTA #225 vs Sierra S.WTA #101
2-0L
16 Sept2026
Brace C.WTA #328 vs Sierra S.WTA #101
1-2W
31 Aug2026
Svitolina E.WTA #6 vs Sierra S.WTA #101
2-0L
12 Aug2026
Sierra S.WTA #101 vs Ito A.WTA #300
0-2L
04 Aug2026
Sierra S.WTA #101 vs Stephens S.WTA #117
0-2L
28 Jul2026
Sierra S.WTA #101 vs Prozorova T.WTA #123
1-2L
01 Jul2026
Sierra S.WTA #101 vs Gauff C.WTA #5
1-2L
Head-to-Head
Last 10
30 Apr2023
Riera J.WTA #140 vs Sierra S.WTA #101
2-1
22 Apr2023
Riera J.WTA #140 vs Sierra S.WTA #101
2-1
24 Feb2023
Sierra S.WTA #101 vs Riera J.WTA #140
2-1
19 Jan2023
Sierra S.WTA #101 vs Riera J.WTA #140
2-0
12 Jan2023
Riera J.WTA #140 vs Sierra S.WTA #101
2-1
14 Oct2022
Sierra S.WTA #101 vs Riera J.WTA #140
2-0

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