Jan Kobierski vs Spencer Johnson — San Diego 2 Qualifying Round of 32

San Diego 2 · CHALLENGER · Qualifying Round of 32
AUT
Jan Kobierski
22 yrs · 183 cm · Right-handed
Last 10 · pre-match
LLLWLLWWLW
0 — 2
Sets
Sunday, 20 September 2026 ·
hard
Spencer Johnson
USA
Spencer Johnson
#449ATP
$55kYTD
$63kCAREER
23 yrs
Last 10 · pre-match
WLWLLWWWWW
Kobierski J.
6-7 3-6
Johnson S.
Kobierski J.
6330
Johnson S.
7762

Spencer Johnson defeated Jan Kobierski in the qualifying second round of the San Diego 2 hard court tournament, winning 7-6, 6-3. Johnson served two aces to Kobierski's one and made one double fault to Kobierski's none. Neither player converted a break point or won a service break.

Generated automatically from Umpiry match data.

Momentum · Final
Kobierski J.5/10
Johnson S.7/11

hold to 0/15to 30to 40 / deucebroken

Key context

Head to head

No previous meetings on record.

Statistics

This season
Kobierski J.Johnson S.
1st serve in·Slight edge
79%
68%
1st serve points won·Clear edge
51%
71%
2nd serve points won·Clear edge
43%
59%
Service points won·Clear edge
49%
67%
Return points won·Clear edge
26%
38%
Break points saved·Clear edge
47%
68%
Aces / match·Dominant
0.0
9.1
Double faults / match·Dominant
0.0
2.0

Averages over each player's completed matches in the selected window (2 vs 7). ATP, WTA & Challenger.

Win Probability

Pre-match · updated 18:50 UTC
Kobierski J.12%
Johnson S.88%
Toss-up
50–58%
Slight edge
58–67%
Clear favourite
67–80%
Strong favourite
80%+

Strong favourite · Johnson S. heavily favoured

Calibrated model · 63% favourite accuracy (2025–26, out-of-sample). Probability is a statistical estimate, not a certainty. How it works.

Umpiry Score

Pre-match
Kobierski J.
5.6
Slight disadvantageUmpiry ScorePartial · surface data limited
Johnson S.
6.2
Even matchUmpiry ScorePartial · surface data limited
Form & Matchup
5.0No prior meetings
H2H
5.0No prior meetings
Surface form
5.56 of last 10 on hard
0.0Lost last 2
Win streak
0.0
Fatigue & Travel
3-set count
7.01 three-setter in 14 days
Country comfort
6.7Won 79% in USA (56)
6.0Clay → Hard
Surface transition
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.

Freshness

Recent load
Kobierski J.Johnson S.
Freshness·Slight edge
86
75

Kobierski J.: 1 day rest · 1 match, 22 games (7d) · Johnson S.: 1 day rest · 2 matches, 48 games (7d). Higher means fresher. About

Conditions

Weather
30°COvercast
Wind 6 km/hHumidity 67%

Draw