Coco Gauff vs Solana Sierra — United Cup Round Robin

United Cup · WTA · Round Robin
Coco Gauff
USA
Coco Gauff
#7WTA
2071ELO
2035Hard ELO
$2.9MYTD
$33MCAREER
22 yrs · 175 cm · Right-handed
Last 10 · pre-match
LWWWWWLLWW
2 — 0
Sets
Monday, 5 January 2026
hard
Solana Sierra
ARG
Solana Sierra
#56WTA
1783ELO
1657Hard ELO
22 yrs · Right-handed
Last 10 · pre-match
LWLWWLWLWW
Gauff C.
6-1 6-1
Sierra S.
Gauff C.
662
Sierra S.
110

Coco Gauff defeated Solana Sierra 6-1 6-1 in the United Cup round robin on hard. The result followed the form book — Coco Gauff came in ranked #7, leading the head-to-head 2–0. Coco Gauff extended the head-to-head to 3–0.

Key context

Head to head

2–0
DateTournamentRoundSurfaceWinnerScore
2026-07-01WimbledonR64grassCoco Gauff3-6 6-3 6.7-7.10
2026-05-09RomeR32clayCoco Gauff5-7 6-0 6-4
View full head-to-head →

Serve vs return

This season
Gauff C.serving74% hold

wins 60% of points on serve vs Sierra S.

Sierra S.serving58% hold

wins 53% of points on serve vs Gauff C.

Serve advantage — Gauff C.

Each player's serve crossed against the other's return, converted to expected hold of serve. Recent completed matches, ATP, WTA & Challenger. About

Serve & return on hard

Gauff C.Sierra S.
25
Serve
12
100
Return
6

Per-surface Serve / Return Rating (0–100, percentile within the hard field, opponent-adjusted over 52 weeks). About

Statistics

This season
Gauff C.Sierra S.
1st serve in·Even
64%
63%
1st serve points won·Slight edge
67%
62%
2nd serve points won·Even
38%
41%
Service points won·Even
57%
54%
Return points won·Slight edge
47%
42%
Break points saved·Even
56%
54%
Aces / match·Slight edge
3.2
2.2
Double faults / match·Dominant
7.2
4.5

Averages over each player's completed matches in the selected window (18 vs 21). ATP, WTA & Challenger.

Clutch

Under pressure
Gauff C.Sierra S.
Clutch Rating·Clear edge
99
86
Break points saved·Clear edge
96
81
Break points won·Even
100
96
Deciding sets·Slight edge
100
92
Tiebreaks·Slight edge
99
88

Performance in the biggest moments — break points, deciding sets and tiebreaks (0–100, higher is better). About

Umpiry Score

Pre-match
Gauff C.
6.2
Even matchUmpiry Score
  • Extended break: 65 days (−1.2)
Sierra S.
3.4
Heavy underdogUmpiry Score
  • Extended break: 63 days (−1.2)
Form & Matchup
10.0+378 Hard Elo edge
Surface ELO
0.0Hard Elo 1657
9.9Overall Elo 2071
ELO gap
0.1Overall Elo 1783
5.0
H2H
5.0
6.7
Surface form
5.4
0.0
Win streak
Fatigue & Travel
Surface transition
6.0
Context
5.0
Defending pts
5.0
5.0
Opponent rise

The Umpiry Score combines match-context factors — matchup, form, fatigue, travel and motivation — into a single 0–10 score, updated daily. Read how it works.

Freshness

Recent load
Gauff C.Sierra S.
Freshness·Dominant
54
90

Gauff C.: 2 days rest · 3 matches, 85 games (7d) · Sierra S.: 10 days rest · 2 matches (14d). Higher means fresher. About

Conditions

Court speed
Medium-slowfavours grinders
SlowFast

Draw

Final
Bencic B.
Swiatek I.
3-66-06-3
Semi-finals
Gauff C.
Swiatek I.
6-46-2
Bencic B.
Mertens E.
6-34-67-60
Quarter-finals
Mertens E.
Krejcikova B.
5-76-17-5
Gauff C.
Sakkari M.
6-36-2
Bencic B.
Sierra S.
6-26-2
Swiatek I.
Joint M.
6-16-1
Round Robin
Gauff C.
Sierra S.
6-16-1
Krejcikova B.
Helgo M.
6-46-3
Bouzas Maneiro J.
Gauff C.
6-16-736-0
Swiatek I.
Lys E.
3-66-36-4
Sakkari M.
Raducanu E.
6-33-66-1
Sakkari M.
Osaka N.
6-46-2
Lys E.
Lamens S.
6-26-2
Mboko V.
Zhu L.
2-66-26-0
Swiatek I.
Lamens S.
6-36-2
Mertens E.
Mboko V.
6-33-66-3
Krejcikova B.
Joint M.
6-46-1
Mertens E.
Zhu L.
6-26-2
Hunter S.
Helgo M.
6-27-63
Bencic B.
Paolini J.
6-46-3
Paolini J.
Jeanjean L.
6-26-3
Osaka N.
Swan K.
7-646-1
Sierra S.
Bouzas Maneiro J.
6-45-76-0
Bencic B.
Jeanjean L.
6-26-4