Statistical Analysis and Estimated Tennis Ratings to the 10,000th of a Point
Match History (2022) View Advanced Player Stats
Jonathan Lefferts (San Anselmo, CA)
Male 		4.5 C
12/31/2024
Estimated Dynamic Rating 4.1486
12/29/2024
Projected Year End Rating ------
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4.5 Rating Meter
Rating Meter
4.0001 - 4.5000
Recent Match History Current Rating History
2022 Overall Season [Doubles]
League/Level Total
Matches		 Win Loss Tie WPct Total
Sets		 Win Loss WPct Total
Games		 Win Loss WPct Defaults
Adult 18+ 4.5 5 5 0 0 100.0 12 10 2 83.3 90 58 32 64.4 0
Adult 40+ 4.5 6 5 1 0 83.3 12 10 2 83.3 108 68 40 63.0 0
Adult 40+ 5.0 2 1 1 0 50.0 5 2 3 40.0 36 15 21 41.7 0
Combo 8.5 3 2 1 0 66.7 6 4 2 66.7 59 31 28 52.5 0
Mixed 18+ 9.0 4 0 4 0 0.0 9 1 8 11.1 74 27 47 36.5 0
Mixed 40+ 9.0 3 2 1 0 66.7 6 4 2 66.7 54 30 24 55.6 0
Total 23 15 8 0 65.2 50 31 19 62.0 421 229 192 54.4 0
Match Date League Team Court Partner Opponent(s) W/L Result Match Rating
11/02/2022 Combo
8.5		 MARIN TC CM8.5A
No California		 D1 John Backof
(4.05) 		Jeffrey Fisher
(4.13)
Jesse Eisenhardt
(3.84) 		W 6-4
7-5		 4.23 -----
10/23/2022 Combo
8.5		 MARIN TC CM8.5A
No California		 D2 Mike Schulist
(3.65) 		Cory Fulchiron
(4.37)
Kushal Chakrabarty
(3.86) 		L 6-3
6-2		 4.24 -----
10/18/2022 Combo
8.5		 MARIN TC CM8.5A
No California		 D2 Christopher Brawer
(3.96) 		Michel Seifer
(4.32)
Troy Pewitt
(3.79) 		W 7-6
6-1		 4.44 -----
08/28/2022 Mixed 40+
9.0		 MARIN TC 40MX9.0A
No California		 D2 Brooke Juhl
(4.26) 		David Herron
(4.14)
Janine Schiess
(4.46) 		W 6-3
6-3		 S 4.31
08/19/2022 Mixed 40+
9.0		 MARIN TC 40MX9.0A
No California		 D3 Alexis Kirkland
(4.19) 		Robert Blechman
(4.22)
Christine Costamagna
(4.47) 		L 6-2
6-4		 4.24 4.31
07/07/2022 Mixed 40+
9.0		 MARIN TC 40MX9.0A
No California		 D1 Amy See
(4.14) 		Georgina Goldman
(4.73)
Peter Olsen
(3.79) 		W 6-3
6-3		 4.53 4.36
06/17/2022 Adult 18+
4.5		 MARIN TC 18AM4.5A
No California		 D1 Chris Trepte
(4.42) 		Antonio Vigil
(4.20)
Jake Lam
(4.24) 		W 4-6
6-0
1-0		 4.43 4.42
05/23/2022 Adult 18+
4.5		 MARIN TC 18AM4.5A
No California		 D2 Chris Trepte
(4.33) 		Stefan Serbicki
(4.55)
Kevin Hinson
(4.18) 		W 6-0
6-2		 4.78 4.49
05/07/2022 Adult 18+
4.5		 MARIN TC 18AM4.5A
No California		 D1 William Dagley
(4.26) 		Steven Colletto
(4.42)
Jake Lam
(4.26) 		W 2-6
6-3
1-0		 4.41 4.39
04/30/2022 Adult 18+
4.5		 MARIN TC 18AM4.5A
No California		 D1 Chris Trepte
(4.22) 		Sacha Drazien
(4.11)
Steffen Kuehr
(4.23) 		W 7-6
6-0		 4.47 4.40
04/26/2022 Adult 18+
4.5		 MARIN TC 18AM4.5A
No California		 D1 Chris Trepte
(4.23) 		Andrew Dailey
(4.41)
Craig Patterson
(4.21) 		W 6-3
7-6		 4.46 4.39
04/15/2022 Mixed 18+
9.0
Sectionals		 RAFAEL RC 18MX9.0A
No California		 D2 Anna Varnay-Truong
(4.30) 		Helen Tam
(4.04)
Kevin Wang
(4.66) 		L 6-2
6-4		 4.16 4.29
04/15/2022 Mixed 18+
9.0
Sectionals		 RAFAEL RC 18MX9.0A
No California		 D2 Jacqueline Osterman
(4.21) 		David Mann
(4.67)
Kristen Foster
(3.86) 		L 4-6
6-3
1-0		 4.27 4.31
03/13/2022 Adult 40+
4.5		 MARIN TC 40AM4.5A
No California		 D1 Chris Trepte
(4.18) 		Christopher Colwell
(4.25)
David Mullarkey
(4.33) 		L 7-6
6-2		 4.25 4.36
03/09/2022 Adult 40+
4.5		 MARIN TC 40AM4.5A
No California		 D3 Mike Downs
(4.45) 		Dallas DeKeyrel
(3.98)
Kenneth Shapiro
(4.14) 		W 6-3
6-2		 4.28 4.37
03/05/2022 Mixed 18+
9.0		 RAFAEL RC 18MX9.0A
No California		 D1 Erin Chamberlin
(3.62) 		Amy See
(4.16)
Favio De Marco
(4.29) 		L 6-4
6-2		 4.38 4.32
03/05/2022 Adult 40+
4.5		 MARIN TC 40AM4.5A
No California		 D2 Daniel Krebs
(4.28) 		Thomas Schmidt
(4.09)
Michael Moon
(4.07) 		W 6-2
6-3		 4.37 4.39
02/10/2022 Adult 40+
5.0		 MARIN TC 40AM5.0+A
No California		 D2 Daniel Krebs
(4.28) 		William Breck
(4.20)
Andre Mancl
(4.05) 		W 6-3
2-6
1-0		 4.21 4.39
01/29/2022 Adult 40+
4.5		 MARIN TC 40AM4.5A
No California		 D1 Mike Downs
(4.40) 		Jonathan Chinn
(4.29)
Michael Volkin
(4.33) 		W 6-3
6-2		 4.56 4.45
01/23/2022 Mixed 18+
9.0		 RAFAEL RC 18MX9.0A
No California		 D1 Alison St Sure
(4.05) 		Chris Trepte
(4.38)
Amy See
(4.16) 		L 6-4
6-2		 4.21 4.31
01/21/2022 Adult 40+
4.5		 MARIN TC 40AM4.5A
No California		 D2 Jeff Marquis
(4.07) 		Chris Morgan
(4.17)
Paul Stiff
(4.27) 		W 6-4
6-4		 4.49 4.42
01/15/2022 Adult 40+
4.5		 MARIN TC 40AM4.5A
No California		 D1 Daniel Krebs
(4.17) 		Jonathan Chinn
(4.38)
Steve Carter
(4.26) 		W 6-3
6-1		 4.69 4.40
01/06/2022 Adult 40+
5.0		 MARIN TC 40AM5.0+A
No California		 D3 Chris Trepte
(4.28) 		Chris Wolfe
(-----)
John Buckley
(4.16) 		L 6-3
6-3		 S 4.32
11/02/2022 D1 Combo
8.5
MARIN TC CM8.5A
No California		 W TIBURON PEN C CM8.5A
No California
John Backof (4.05) 6-4
7-5		 Jeffrey Fisher (4.13)
Jesse Eisenhardt (3.84)
Match: 4.23 Rating: -----
10/23/2022 D2 Combo
8.5
MARIN TC CM8.5A
No California		 L ROLLING HILLS CM8.5A
No California
Mike Schulist (3.65) 6-3
6-2		 Cory Fulchiron (4.37)
Kushal Chakrabarty (3.86)
Match: 4.24 Rating: -----
10/18/2022 D2 Combo
8.5
MARIN TC CM8.5A
No California		 W TIBURON PEN C CM8.5A
No California
Christopher Brawer (3.96) 7-6
6-1		 Michel Seifer (4.32)
Troy Pewitt (3.79)
Match: 4.44 Rating: -----
08/28/2022 D2 Mixed 40+
9.0
MARIN TC 40MX9.0A
No California		 W HARBOR PT 40MX9.0A
No California
Brooke Juhl (4.26) 6-3
6-3		 David Herron (4.14)
Janine Schiess (4.46)
Match: S Rating: 4.31
08/19/2022 D3 Mixed 40+
9.0
MARIN TC 40MX9.0A
No California		 L HARBOR PT 40MX9.0A
No California
Alexis Kirkland (4.19) 6-2
6-4		 Robert Blechman (4.22)
Christine Costamagna (4.47)
Match: 4.24 Rating: 4.31
07/07/2022 D1 Mixed 40+
9.0
MARIN TC 40MX9.0A
No California		 W HARBOR PT 40MX9.0A
No California
Amy See (4.14) 6-3
6-3		 Georgina Goldman (4.73)
Peter Olsen (3.79)
Match: 4.53 Rating: 4.36
06/17/2022 D1 Adult 18+
4.5
MARIN TC 18AM4.5A
No California		 W MAGNOLIA/M PK 18AM4.5A
No California
Chris Trepte (4.42) 4-6
6-0
1-0		 Antonio Vigil (4.20)
Jake Lam (4.24)
Match: 4.43 Rating: 4.42
05/23/2022 D2 Adult 18+
4.5
MARIN TC 18AM4.5A
No California		 W ROLLING HILLS 18AM4.5A
No California
Chris Trepte (4.33) 6-0
6-2		 Stefan Serbicki (4.55)
Kevin Hinson (4.18)
Match: 4.78 Rating: 4.49
05/07/2022 D1 Adult 18+
4.5
MARIN TC 18AM4.5A
No California		 W MAGNOLIA/M PK 18AM4.5A
No California
William Dagley (4.26) 2-6
6-3
1-0		 Steven Colletto (4.42)
Jake Lam (4.26)
Match: 4.41 Rating: 4.39
04/30/2022 D1 Adult 18+
4.5
MARIN TC 18AM4.5A
No California		 W MARINWOOD COMM CTR 18AM4.5A
No California
Chris Trepte (4.22) 7-6
6-0		 Sacha Drazien (4.11)
Steffen Kuehr (4.23)
Match: 4.47 Rating: 4.40
04/26/2022 D1 Adult 18+
4.5
MARIN TC 18AM4.5A
No California		 W MILL VALLEY 18AM4.5A
No California
Chris Trepte (4.23) 6-3
7-6		 Andrew Dailey (4.41)
Craig Patterson (4.21)
Match: 4.46 Rating: 4.39
04/15/2022 D2 Mixed 18+
9.0
Sectionals
RAFAEL RC 18MX9.0A
No California		 L MERVYN MORRIS PK 18MX9.0A
No California
Anna Varnay-Truong (4.30) 6-2
6-4		 Helen Tam (4.04)
Kevin Wang (4.66)
Match: 4.16 Rating: 4.29
04/15/2022 D2 Mixed 18+
9.0
Sectionals
RAFAEL RC 18MX9.0A
No California		 L ROUND HILL CC 18MX9.0A
No California
Jacqueline Osterman (4.21) 4-6
6-3
1-0		 David Mann (4.67)
Kristen Foster (3.86)
Match: 4.27 Rating: 4.31
03/13/2022 D1 Adult 40+
4.5
MARIN TC 40AM4.5A
No California		 L ROLLING HILLS 40AM4.5A
No California
Chris Trepte (4.18) 7-6
6-2		 Christopher Colwell (4.25)
David Mullarkey (4.33)
Match: 4.25 Rating: 4.36
03/09/2022 D3 Adult 40+
4.5
MARIN TC 40AM4.5A
No California		 W ROLLING HILLS 40AM4.5A
No California
Mike Downs (4.45) 6-3
6-2		 Dallas DeKeyrel (3.98)
Kenneth Shapiro (4.14)
Match: 4.28 Rating: 4.37
03/05/2022 D1 Mixed 18+
9.0
RAFAEL RC 18MX9.0A
No California		 L MARIN TC 18MX9.0A
No California
Erin Chamberlin (3.62) 6-4
6-2		 Amy See (4.16)
Favio De Marco (4.29)
Match: 4.38 Rating: 4.32
03/05/2022 D2 Adult 40+
4.5
MARIN TC 40AM4.5A
No California		 W MARINWOOD COMM CTR 40AM4.5A
No California
Daniel Krebs (4.28) 6-2
6-3		 Thomas Schmidt (4.09)
Michael Moon (4.07)
Match: 4.37 Rating: 4.39
02/10/2022 D2 Adult 40+
5.0
MARIN TC 40AM5.0+A
No California		 W TIBURON PEN C 40AM5.0+A
No California
Daniel Krebs (4.28) 6-3
2-6
1-0		 William Breck (4.20)
Andre Mancl (4.05)
Match: 4.21 Rating: 4.39
01/29/2022 D1 Adult 40+
4.5
MARIN TC 40AM4.5A
No California		 W MAGNOLIA/M PK 40AM4.5A
No California
Mike Downs (4.40) 6-3
6-2		 Jonathan Chinn (4.29)
Michael Volkin (4.33)
Match: 4.56 Rating: 4.45
01/23/2022 D1 Mixed 18+
9.0
RAFAEL RC 18MX9.0A
No California		 L MARIN TC 18MX9.0A
No California
Alison St Sure (4.05) 6-4
6-2		 Chris Trepte (4.38)
Amy See (4.16)
Match: 4.21 Rating: 4.31
01/21/2022 D2 Adult 40+
4.5
MARIN TC 40AM4.5A
No California		 W MILL VALLEY 40AM4.5A
No California
Jeff Marquis (4.07) 6-4
6-4		 Chris Morgan (4.17)
Paul Stiff (4.27)
Match: 4.49 Rating: 4.42
01/15/2022 D1 Adult 40+
4.5
MARIN TC 40AM4.5A
No California		 W MAGNOLIA/M PK 40AM4.5A
No California
Daniel Krebs (4.17) 6-3
6-1		 Jonathan Chinn (4.38)
Steve Carter (4.26)
Match: 4.69 Rating: 4.40
01/06/2022 D3 Adult 40+
5.0
MARIN TC 40AM5.0+A
No California		 L OLYMPIC 40AM5.0+A
No California
Chris Trepte (4.28) 6-3
6-3		 Chris Wolfe (-----)
John Buckley (4.16)
Match: S Rating: 4.32
Glossary
Match Player rating for individual match.
Rating Dynamic rating after completed match.
NC Match not yet calculated into rating.
S Self rated or unrated player involved in match so no match rating calculated for current player.
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