Adolfo Daniel Vallejo vs Nicolas Mejia — Wimbledon Round of 128

Wimbledon · ATP · Round of 128
Adolfo Daniel Vallejo
PAR
Adolfo Daniel Vallejo
#73ATP
1755ELO
1627Grass ELO
$396kYTD
$653kCAREER
22 yrs · 183 cm · Right-handed
Last 10
LLWLWWWLWW
—
Sets
Monday, 29 June 2026 ·
grass
Nicolas Mejia
COL
Nicolas Mejia
#168ATP
1486ELO
1443Grass ELO
$141kYTD
$522kCAREER
26 yrs · 183 cm · Right-handed
Last 10
WWWLWLLLWL
Vallejo A.
vs
Mejia N.

Adolfo Daniel Vallejo faces Nicolas Mejia in the Wimbledon round of 128 on grass. Adolfo Daniel Vallejo is the paper favourite — ranked #73, a roughly 180-point grass Elo advantage — but Nicolas Mejia rides a 3-match win streak.

Win Probability

Pre-match · updated 13:20 UTC
Vallejo A.89%
Mejia N.11%
Toss-up
50–58%
Slight edge
58–67%
Clear favourite
67–80%
Strong favourite
80%+

Strong favourite · Vallejo A. heavily favoured

Calibrated model · 65% favourite accuracy (2025–26, out-of-sample). Probability is a statistical estimate, not a certainty. How it works.

Key context

Umpiry Score

Pre-match
Vallejo A.
7.2
Strong advantageUmpiry ScorePartial · surface data limited
Mejia N.
5.7
Slight disadvantageUmpiry Score
Form & Matchup
7.3+184 Grass Elo edge
Surface ELO
2.7Grass Elo 1443
8.4Overall Elo 1755
ELO gap
1.6Overall Elo 1486
5.0No prior meetings
H2H
5.0No prior meetings
Surface form
6.54 of last 7 on grass
0.0Lost last 2
Win streak
7.03-match win streak
Fatigue & Travel
3-set count
0.03 three-setters in 14 days
Context
5.0Didn't play here last year
Defending pts
5.0Didn't play here last year

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.

Form trajectory

Vallejo A.Cooling
Mejia N.Sliding

Direction of recent form — results vs Elo expectation blended with serve/return vs each player's baseline, over the last few months. About

41 vs 31 matches

Statistics

This season
Vallejo A.Mejia N.
1st serve in·Even
62%
60%
1st serve points won·Even
68%
69%
2nd serve points won·Even
52%
53%
Service points won·Even
62%
63%
Return points won·Slight edge
45%
38%
Break points saved·Even
59%
60%
Aces / match·Clear edge
3.1
4.7
Double faults / match·Even
2.3
2.0

Averages over each player's completed matches in the selected window (41 vs 31). ATP, WTA & Challenger.

Serve vs return

This season
Vallejo A.serving84% hold

wins 66% of points on serve vs Mejia N.

Mejia N.serving74% hold

wins 60% of points on serve vs Vallejo A.

Serve advantage — Vallejo A.

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

Clutch

Under pressure
Vallejo A.Mejia N.
Clutch Rating·Dominant
54
22
Break points saved·Even
71
74
Break points won·Dominant
65
6
Deciding sets·Dominant
85
32
Tiebreaks·Dominant
0
32

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

Freshness

Recent load
Vallejo A.Mejia N.
Freshness·Dominant
91
59

Vallejo A.: 5 days rest · 1 match, 26 games (7d) · Mejia N.: 1 day rest · 3 matches, 80 games (7d). Higher means fresher. About

Conditions

Court speed
Medium-fastrewards aggression
SlowFast
Weather forecast
18°CPartly cloudy
Wind 9 km/hHumidity 55%

Head to head

No previous meetings on record.

Draw — qualifying

Quarter-finals
Semi-finals
Final
Comesana F.[1]
Moro Canas A.
6-46-754-6
Moreno De Alboran N.
Mayot H.
2-62-6
Sanchez Izquierdo N.
Kwon S.
6-773-6
Brancaccio R.
Gea A.[18]
5-73-6
Faria J.[2]
Grenier H.
6-36-3
Lajal M.
Pavlovic L.
4-64-6
Chidekh C.
Dougaz A.
4-64-6
Matusevich A.
Sakamoto R.[27]
6-766-33-6
Yunchaokete B.[3]
Dellien H.
6-46-0
Gomez F.
Tabur C.
3-64-6
Giustino L.
Onclin G.
3-65-7
Sachko V.
Mochizuki S.[21]
3-66-74
Wong C.[4]
Gojo B.
6-7102-6
Andrade A.
Smith C.
3-66-43-6
Djere L.
Houkes M.
6-47-5
Squire H.
Zheng M.[26]
2-66-73
Gaston H.[5]
Midon L.
4-66-36-4
Cadenasso G.
Cina F.
3-62-6
Smith K.
Ficovich J.
6-17-64
Butvilas E.
Echargui M.[29]
6-35-73-6
Basilashvili N.[6]
Ymer E.
6-23-66-78
Skatov T.
Barrena A.
6-37-64
Guerrieri A.
Goffin D.
3-67-56-2
Boscardin Dias P.
Jacquet K.[25]
1-66-73
Llamas Ruiz P.[7]
Added D.
6-26-4
Bailly G.
Martin Tiffon P.
4-64-6
Boyer T.
Olivieri G.
6-16-4
Clarke J.
Pellegrino A.[17]
6-26-754-6
Budkov Kjaer N.[8]
Reis Da Silva J.
6-46-766-1
Dodig M.
Ferreira Silva F.
3-67-607-65
Noguchi R.
Nardi L.
2-63-6
Virtanen O.
Martinez P.[19]
6-41-66-1
Rocha H.[9]
Mejia N.
4-67-662-6
Tseng C.
Heide G.
6-784-6
Prado Angelo J.
Evans D.
6-723-6
Monday J.
Schoolkate T.[28]
5-73-6
Maestrelli F.[10]
Basing M.
6-46-724-6
Gentzsch T.
Kolar Z.
6-36-3
Draxl L.
Bertola R.
6-26-731-6
Crawford O.
Rodionov J.[30]
4-64-6
Sweeny D.[11]
Roncadelli F.
6-46-2
Blanch D.
Blanchet U.
Herbert P.
Jubb P.
5-76-76
Cecchinato M.
Barrios Vera T.[20]
6-723-6
Diaz Acosta F.[12]
Galarneau A.
2-62-6
Tarvet O.
Bolt A.
7-637-5
Coria F.
Bonding O.
7-656-2
Hsu Y.
Sakellaridis S.[31]
4-62-6
Mcdonald M.[13]
Meligeni Alves F.
6-26-756-3
M. Ceban
Carballes Baena R.
2-64-6
Uchida K.
Tomic B.
3-62-6
Schwaerzler J.
C. O'Connell[32]
6-734-6
Gaubas V.[14]
Mmoh M.
4-66-36-2
Zhang Z.
Searle H.
3-64-6
Bax F.
Rodesch C.
7-641-64-6
Neumayer L.
Lajovic D.[22]
4-64-6
Safiullin R.[15]
Mccabe J.
6-37-64
Glinka D.
Coppejans K.
4-63-6
Kym J.
Bueno G.
4-67-56-1
Broady L.
Holmgren A.[24]
6-766-45-7
Travaglia S.[16]
Mikrut L.
7-57-63
Den Ouden G.
Zhou Y.
4-64-6
Piros Z.
Ivanov I.
6-26-2
Napolitano S.
Harris B.[23]
2-62-6
Moro Canas A.
Mayot H.
6-37-63
Kwon S.
Gea A.[18]
5-76-36-4
Faria J.[2]
Pavlovic L.
6-46-4
Dougaz A.
Sakamoto R.[27]
4-64-6
Yunchaokete B.[3]
Tabur C.
7-56-744-6
Onclin G.
Mochizuki S.[21]
2-66-43-6
Gojo B.
Smith C.
4-64-6
Djere L.
Zheng M.[26]
5-73-6
Gaston H.[5]
Cina F.
7-56-4
Smith K.
Echargui M.[29]
4-66-36-76
Ymer E.
Skatov T.
4-61-6
Guerrieri A.
Jacquet K.[25]
6-794-6
Llamas Ruiz P.[7]
Martin Tiffon P.
6-46-2
Boyer T.
Pellegrino A.[17]
6-26-1
Budkov Kjaer N.[8]
Dodig M.
6-27-64
Nardi L.
Virtanen O.
4-64-6
Mejia N.
Heide G.
6-46-3
Evans D.
Schoolkate T.[28]
5-70-6
Basing M.
Gentzsch T.
7-56-2
Bertola R.
Rodionov J.[30]
4-67-646-2
Sweeny D.[11]
Blanch D.
2-67-674-0
Jubb P.
Barrios Vera T.[20]
4-66-31-6
Galarneau A.
Tarvet O.
5-72-6
Coria F.
Sakellaridis S.[31]
3-64-6
Mcdonald M.[13]
Carballes Baena R.
6-46-4
Tomic B.
C. O'Connell[32]
4-64-6
Gaubas V.[14]
Searle H.
7-657-65
Rodesch C.
Lajovic D.[22]
2-64-6
Safiullin R.[15]
Coppejans K.
7-627-5
Kym J.
Holmgren A.[24]
6-46-3
Travaglia S.[16]
Zhou Y.
6-774-6
Piros Z.
Harris B.[23]
4-64-6
Moro Canas A.
Kwon S.
4-66-763-6
Faria J.[2]
Sakamoto R.[27]
7-634-66-36-4
Tabur C.
Mochizuki S.[21]
6-15-76-23-61-6
Smith C.
Zheng M.[26]
4-66-42-63-6
Gaston H.[5]
Echargui M.[29]
6-15-76-26-4
Skatov T.
Jacquet K.[25]
6-754-64-6
Llamas Ruiz P.[7]
Boyer T.
5-77-646-723-6
Budkov Kjaer N.[8]
Virtanen O.
6-44-64-65-7
Mejia N.
Schoolkate T.[28]
6-46-46-4
Basing M.
Bertola R.
2-66-43-67-56-2
Sweeny D.[11]
Barrios Vera T.[20]
4-66-47-650-66-2
Tarvet O.
Sakellaridis S.[31]
6-46-27-5
Mcdonald M.[13]
C. O'Connell[32]
6-36-46-4
Gaubas V.[14]
Lajovic D.[22]
3-66-43-66-36-4
Safiullin R.[15]
Kym J.
4-67-623-67-666-4
Zhou Y.
Harris B.[23]
6-16-722-63-6