Teams

The Players Club

2025 WINTER A18&O WEEKEND · 2025 Winter A18&O 4.5 MEN

19 players · average NTRP 4.55 / OHIO VALLEY

No matches recorded for this roster in this league — it may be a placeholder registration, or the season may not have started.

View scouting list →
Schedule16 played
2025-05-18vs Racquet Club/ScarboroughLost 14
L#1 DoublesJamie Marksberry / Walter Samora vs Jeffrey Cempre / Dale Wynkoop6-2, 5-7, 0-1
L#1 SinglesJames Hackett vs Matthew Warburton1-6, 1-6
W#2 DoublesAaron Koch / Johaun Cheng vs Dane Poppe / James MacKey6-4, 7-5
L#2 SinglesMark Waterstreet vs Jack Baesman3-6, 3-6
L#3 DoublesByron Williams / Ayush Kedia vs Rob Ashmead / Michael Johansen2-5
2025-05-04vs New AlbanyWon 32
L#1 DoublesJoey Frank / Raphael Thurber vs R Pepino / Bradley Strawser4-6, 3-6
W#1 SinglesDavid Hess vs Federico Ochoa6-3, 6-3
L#2 DoublesJamie Marksberry / Walter Samora vs Patrick French / Ryan Shutt1-6, 6-4, 0-1
W#2 SinglesNick Kowalczyk vs Evan Mitelman6-3, 6-2
W#3 DoublesGriffin Celleghin / Daniel Reed Detrick vs J R Pepino / Milan Jovanovic6-1, 6-1
2025-04-27vs OlympicWon 50
W#1 DoublesDavid Hess / Raphael Thurber vs Jeremy Dominik / Alexander Thompson6-4, 6-1
W#1 SinglesGriffin Celleghin vs Matthew Soter6-3, 6-3
W#2 DoublesJamie Marksberry / Walter Samora vs Alex Novikoff / Frank Isabelle6-2, 6-1
W#2 SinglesNick Kowalczyk vs Vishwas Jena6-2, 6-2
W#3 DoublesJohaun Cheng / Vinh Thai vs Alex Yadegari / Thomas Nguyen7-6, 6-4
2025-04-13vs ElysiumWon 30
W#1 DoublesDavid Hess / Michael Herzog vs Adam Schrock / David Motta6-3, 6-2
W#1 SinglesNick Kowalczyk vs Jack Schadek6-3, 6-2
W#2 SinglesAlexander MacHtay vs Harsh Bakshi1-6, 7-5, 1-0
2025-03-31vs ElysiumLost 01
L#1 SinglesGriffin Celleghin vs Andrew Codita3-6, 4-6
2025-03-30vs Racquet Club/ScarboroughWon 32
W#1 DoublesDaniel Reed Detrick / Griffin Celleghin vs Avery Clouse / Colton MacE6-2, 6-0
L#1 SinglesMark Waterstreet vs Brett Hoch1-6, 1-6
W#2 DoublesJamie Marksberry / Michael Herzog vs Dane Poppe / James MacKey6-4, 6-3
W#2 SinglesAlexander MacHtay vs Jacob Osterhout4-6, 6-1, 1-0
L#3 DoublesAyush Kedia / James Hackett vs Michael Johansen / Jack Baesman6-4, 4-6, 0-1
2025-03-23vs New AlbanyLost 05
L#1 DoublesJamie Marksberry / Walter Samora vs Bradley Portnoy / Bradley Strawser4-6, 7-5, 0-1
L#1 SinglesJoey Frank vs Noah Fox6-7, 5-7
L#2 DoublesDaniel Reed Detrick / Nick Kowalczyk vs Patrick French / Ryan Shutt3-6, 2-6
L#2 SinglesGriffin Celleghin vs Eric Chabot5-7, 5-7
L#3 DoublesRaphael Thurber / Mark Waterstreet vs Federico Ochoa / Milan Pereira7-5, 2-6, 0-1
2025-03-16vs OlympicWon 41
W#1 DoublesMichael Herzog / Mark Waterstreet vs Alex Novikoff / Vishwas Jena6-3, 6-3
L#1 SinglesJoey Frank vs Jeremy Dominik5-7, 5-7
W#2 DoublesGriffin Celleghin / Daniel Reed Detrick vs Hany Elemary / Konstantin Tsibouris6-0, 4-1
W#2 SinglesNick Kowalczyk vs Dwayne Rash6-2, 6-4
W#3 DoublesDavid Hess / Thomas Runge vs Matthew Soter / Alexander Thompson6-4, 6-7, 1-0
2025-03-09vs ElysiumWon 31
L#1 DoublesMichael Herzog / Raphael Thurber vs Jack Schadek / Michael Stefan5-7, 4-6
W#1 SinglesJoey Frank vs Harsh Bakshi6-2, 6-3
W#2 DoublesByron Williams / David Hess vs Adam Schrock / Bob Gawronski2-6, 6-4, 1-0
W#2 SinglesAlexander MacHtay vs Jeffrey Yu6-4, 6-4
2025-03-07vs WickertreeSplit 11
L#1 DoublesDavid Hess / Michael Herzog vs Casey Cempre / Micah Scott3-6, 4-6
W#1 SinglesPatrick McColgan vs Daniel Bishoff3-2
2025-02-23vs Racquet Club/ScarboroughWon 32
W#1 DoublesJamie Marksberry / Walter Samora vs Matthew Warburton / Dale Wynkoop3-6, 6-4, 1-0
W#1 SinglesJoey Frank vs Brett Hoch6-4, 6-4
W#2 DoublesNick Kowalczyk / Raphael Thurber vs Avery Clouse / Jacob Osterhout4-6, 6-2, 1-0
L#2 SinglesAlexander MacHtay vs Leonardo Trimarchi4-6, 4-6
L#3 DoublesMark Waterstreet / Michael Herzog vs Dane Poppe / James MacKey6-3, 6-7, 0-1
2025-02-23vs WickertreeLost 02
L#1 DoublesPatrick McColgan / Aaron Koch vs Casey Cempre / Micah Scott1-6, 1-6
L#1 SinglesGriffin Celleghin vs Andy MacKler1-6, 1-6
2025-02-16vs New AlbanyLost 14
L#1 DoublesAaron Koch / Mark Waterstreet vs R Pepino / Bradley Strawser3-6, 3-6
L#1 SinglesNick Kowalczyk vs Eric Chabot7-6, 1-6, 0-1
L#2 DoublesMichael Herzog / Jamie Marksberry vs Ryan Shutt / Tetsuro Togawa2-6, 6-3, 0-1
L#2 SinglesJames Hackett vs Milan Pereira4-6, 4-6
W#3 DoublesGriffin Celleghin / Daniel Reed Detrick vs Preston Engel / J R Pepino6-2, 6-3
2025-02-09vs OlympicLost 13
L#1 DoublesMichael Herzog / Raphael Thurber vs Matthew Soter / Alexander Thompson6-7, 6-7
L#2 DoublesJamie Marksberry / Walter Samora vs Konstantin Tsibouris / Michael White4-6, 4-6
W#2 SinglesAlexander MacHtay vs Vishwas Jena6-3, 6-3
L#3 DoublesThomas Runge / Byron Williams vs Jeremy Dominik / Frank Isabelle4-6, 1-6
2025-02-07vs ElysiumSplit 11
L#1 DoublesPatrick McColgan / Aaron Koch vs Andrew Codita / Adam Ewing6-7, 6-7
W#2 DoublesGriffin Celleghin / Daniel Reed Detrick vs Milan Pereira / Tetsuro Togawa6-4, 6-4
2025-02-02vs ElysiumSplit 11
W#1 DoublesGriffin Celleghin / Raphael Thurber vs Jack Schadek / Adam Schrock6-3, 7-5
L#3 DoublesJohaun Cheng / James Hackett vs Bob Gawronski / David Motta6-7, 6-2, 0-1
A tie can be incomplete. Tell us if someone is missing.
i
Grouped by tie — one fixture, several lines. A line shows only when a player on it is someone we have indexed, so an early-season tie for a newly-added team can look short. This also means the line count here will not match the header, which counts individual player appearances.

Flight standings for 2025 Winter A18&O 4.5 MEN have not been collected yet. Where we have them we show every team in the flight ranked, with this team highlighted. The crawler is still filling in older seasons and flights.

ScoutingWhere each opponent usually plays

Signed-in extra: whether this captain plays strict strength order or mixes it up, from every doubles line they have put out. Create a free account to see it.

Roster averages 4.17 estimated across 14 rated players. No lineup is published in advance, so the column below is where each player has actually been used — a captain's habits are the best available forecast. Sign in and claim your record to see who you have played.

David Hess
usually #1 Doubles 50%, also #2 Doubles 17% · published 5
4.49
Griffin Celleghin
usually #1 Singles 30%, also #3 Doubles 20% · published 4.5
4.39
Nick Kowalczyk
usually #2 Singles 43%, also #1 Singles 29% · published
4.36
Raphael Thurber
usually #1 Doubles 71%, also #2 Doubles 14% · published
4.25
Jamie Marksberry
usually #2 Doubles 63%, also #1 Doubles 38% · published 4.5
Aaron Koch
published 4.5
Alek Crnogorac
published 4.5
Daniel Reed Detrick
usually #2 Doubles 50%, also #3 Doubles 33% · published 4.5
4.25
Joey Frank
usually #1 Singles 80%, also #1 Doubles 20% · published
4.24
Mark Waterstreet
usually #1 Doubles 33%, also #3 Doubles 33% · published
4.17
Vinh Thai
usually #3 Doubles 100% · published
4.15
Walter Samora
usually #2 Doubles 50%, also #1 Doubles 50% · published
4.13
Patrick McColgan
usually #1 Doubles 67%, also #1 Singles 33% · published
4.10
James Hackett
usually #3 Doubles 50%, also #2 Singles 25% · published 4.5
4.03
Alexander MacHtay
usually #2 Singles 100% · published 4.5
3.95
Ayush Kedia
usually #1 Doubles 50%, also #3 Doubles 33% · published 4.5
3.95
Johaun Cheng
usually #3 Doubles 67%, also #2 Doubles 33% · published
3.86
Byron Williams
usually #3 Doubles 67%, also #2 Doubles 33% · published 4.5
Michael Herzog
published
Established pairs

Doubles pairs from this roster with three or more matches together anywhere — ordered by performance against what the rating gap predicted, not by record.

Griffin Celleghin + Alek Crnogorac8165% games+10.4% vs expected
Walter Samora + Jamie Marksberry522358% games+1.0% vs expected
Johaun Cheng + James Hackett6555% games−1.1% vs expected
Michael Herzog + Mark Waterstreet5551% gamesnot enough data
Patrick McColgan + Jamie Marksberry5055% gamesnot enough data
Patrick McColgan + Mark Waterstreet2346% gamesnot enough data
Alexander MacHtay + Griffin Celleghin3248% gamesnot enough data
Griffin Celleghin + Daniel Reed Detrick5076% gamesnot enough data
Roster

Ordered by our estimated dynamic rating, which is why two players at the same published level are not tied — a published 4.0 says nothing about where inside the band someone sits. Lines played in this team’s season are shown beside each name.

5
David Hess
32W–17L career · 6 lines in 2025
not enough data
4.5
Griffin Celleghin
65W–13L career · 9 lines in 2025
<1%52%48%
4.49
Nick Kowalczyk
27W–13L career · 7 lines in 2025
<1%79%21%
4.39
Raphael Thurber
13W–11L career · 7 lines in 2025
<1%85%14%
4.36
4.5
Jamie Marksberry
139W–53L career · 8 lines in 2025
3%95%3%
4.25
4.5
Aaron Koch
7W–4L career · no lines in 2025
not enough data
4.5
Alek Crnogorac
16W–8L career · no lines in 2025
not enough data
4.5
Daniel Reed Detrick
5W–2L career · 6 lines in 2025
not enough data
Joey Frank
19W–24L career · 5 lines in 2025
3%95%3%
4.25
Mark Waterstreet
59W–41L career · 6 lines in 2025
3%95%2%
4.24
Vinh Thai
22W–3L career · 1 line in 2025
9%90%1%
4.17
Walter Samora
114W–54L career · 6 lines in 2025
12%88%<1%
4.15
Patrick McColgan
63W–46L career · 3 lines in 2025
16%84%<1%
4.13
4.5
James Hackett
102W–41L career · 4 lines in 2025
22%78%<1%
4.10
4.5
Alexander MacHtay
20W–23L career · 5 lines in 2025
40%60%<1%
4.03
4.5
Ayush Kedia
19W–19L career · 6 lines in 2025
65%35%<1%
3.95
Johaun Cheng
92W–63L career · 3 lines in 2025
66%34%<1%
3.95
4.5
Byron Williams
21W–33L career · 3 lines in 2025
85%15%<1%
3.86
Michael Herzog
33W–12L career · no lines in 2025
not enough data

Three percentages are where each player stands right now: the chance they are below their band, inside it, or above it, on the way they are playing this season. The number on the right is our estimated dynamic rating, which USTA never publishes. This is today rather than a forecast of December, because a forecast has to assume future matches and cannot know whether someone will even be offered them. Percentages are blank where a player has too few matches this season, or at a level where the model does not yet beat a base-rate guess; the estimate is a weaker claim than a probability and survives where those do not.

Not affiliated with or endorsed by the USTA. Ratings labelled as published are USTA year-end figures; anything we describe as an estimate is ours, not USTA’s. Match data is from USTA TennisLink.