ATP tennis predict — Garrett Johns vs Guillaume Dalmasso

Challenger Hard Kingston challenger · qualification - 1. round 20:00

Predicted probability

Garrett Johns

USA

58.55%

Guillaume Dalmasso

France

41.45%

Average Odds

1.28 / 3.18

Market probability

71.30% / 28.70%

Why This Prediction?

Garrett Johns is the favorite because he has a higher Elo rating (1524 vs 1501), fewer double faults per game (0.11 vs 0.28) and more wins on hard courts (2 vs 0).

Player Comparison

1524.3 Elo 1501.5

1506.1 Elo (surface) 1506.0

58 Wins (Challenger) 15

33 Wins (surface) 14

7 Last 15 form 8

0 Head-to-head wins 0

1.067 Dominance ratio 0.967

381 Rank 597

25.7 Age 23.8

right Hand right

Performance vs. the Odds

Career record grouped by how big a favorite the market made each player, based on their average odds.

Garrett Johns

Heavy favorite (odds below 1.30) 3W–0L · 100.0%

Favorite (odds 1.30-1.80) 2W–1L · 66.7%

Even match (odds 1.80-2.20) 0W–1L · 0.0%

Underdog (odds 2.20-4.00) 4W–5L · 44.4%

Heavy underdog (odds above 4.00) 0W–1L · 0.0%

17 matches with market odds since 2026-06-01.

Guillaume Dalmasso

Heavy favorite (odds below 1.30) 2W–0L · 100.0%

Favorite (odds 1.30-1.80) 2W–0L · 100.0%

Even match (odds 1.80-2.20) 2W–1L · 66.7%

Underdog (odds 2.20-4.00) 2W–5L · 28.6%

Heavy underdog (odds above 4.00) 0W–2L · 0.0%

16 matches with market odds since 2026-05-24.

Serve & Return

Serve and return win rates from each player's last 10 matches at the selected level.

Garrett Johns Guillaume Dalmasso

1st Serve In %

49.7%

—

1st Serve Points Won %

73.5%

—

2nd Serve Points Won %

49.4%

—

Return Points Won vs 1st Serve %

23.7%

—

Return Points Won vs 2nd Serve %

46.3%

—

Aces per Service Game

0.57

—

Double Faults per Service Game

0.30

—

Based on each player's last 10 ATP/Grand Slam matches.

1st Serve In %

57.2%

62.2%

1st Serve Points Won %

67.2%

71.8%

2nd Serve Points Won %

54.0%

43.1%

Return Points Won vs 1st Serve %

34.5%

23.9%

Return Points Won vs 2nd Serve %

53.1%

49.8%

Aces per Service Game

0.30

0.41

Double Faults per Service Game

0.19

0.60

Based on each player's last 10 Challenger matches.

Break Point Performance

How each player handles the biggest points - break points saved serving, and converted returning - from their last 10 matches at the selected level.

Garrett Johns Guillaume Dalmasso

Break Points Saved %

53.6%

—

Break Points Converted %

40.9%

—

Based on each player's last 10 ATP/Grand Slam matches.

Break Points Saved %

62.5%

54.1%

Break Points Converted %

45.8%

34.8%

Based on each player's last 10 Challenger matches.

Head-to-Head

Garrett Johns 0 – 0 Guillaume Dalmasso

Hard Kingston challenger · 2026-08-16

qualification - 1. round

Garrett Johns #390

Guillaume Dalmasso #606

6-3 6-1

0 Aces 3

0 Double Faults 6

43 Service Points 45

23 First Serve In 31

15 First Serve Won 17

13 Second Serve Won 4

0 Break Points Saved 3

1 Break Points Faced 8

- Winners -

- Unforced Errors -

1.3 Average Odds 3.2

Garrett Johns vs Guillaume Dalmasso — Prediction