Time Spent at #1

Men
Date	Player	Weeks
Aug-73	Ilie Nastase (1)	40
Jun-74	John Newcombe (2)	8
Jul-74	Jimmy Connors (3)	160
Aug-77	Bjorn Borg (4)	1
Aug-77	Jimmy Connors	84
Apr-79	Bjorn Borg	6
May-79	Jimmy Connors	7
Jul-79	Bjorn Borg	34
Mar-80	John McEnroe (5)	3
Mar-80	Bjorn Borg	20
Aug-80	John McEnroe	1
Aug-80	Bjorn Borg	46
Jul-81	John McEnroe	2
Jul-81	Bjorn Borg	2
Aug-81	John McEnroe	58
Sep-82	Jimmy Connors	7
Nov-82	John McEnroe	1
Nov-82	Jimmy Connors	1
Nov-82	John McEnroe	11
Jan-83	Jimmy Connors	1
Feb-83	John McEnroe	1
Feb-83	Jimmy Connors	2
Feb-83	Ivan Lendl(6)	11
May-83	Jimmy Connors	3
Jun-83	John McEnroe	1
Jun-83	Jimmy Connors	3
Jul-83	John McEnroe	17
Oct-83	Ivan Lendl	6
Dec-83	John McEnroe	4
Jan-84	Ivan Lendl	9
Mar-84	John McEnroe	13
Jun-84	Ivan Lendl	1
Jun-84	John McEnroe	3
Jul-84	Ivan Lendl	5
Aug-84	John McEnroe	53
Aug-85	Ivan Lendl	1
Aug-85	John McEnroe	2
Sep-85	Ivan Lendl	157
Sep-88	Mats Wilander (7)	20
Jan-89	Ivan Lendl	80
Aug-90	Stefan Edberg (8)	24
Jan-91	Boris Becker (9)	3
Feb-91	Stefan Edberg	20
Jul-91	Boris Becker	9
Sep-91	Stefan Edberg	22
Feb-92	Jim Courier (10)	6
Mar-92	Stefan Edberg	3
Apr-92	Jim Courier	22
Sep-92	Stefan Edberg	3
Oct-92	Jim Courier	27
Apr-93	Pete Sampras (11)	19
Aug-93	Jim Courier	3
Sep-93	Pete Sampras	82
Apr-95	Andre Agassi (12)	30
Nov-95	Pete Sampras	12
Jan-96	Andre Agassi	2
Feb-96	Thomas Muster (13)	1
Feb-96	Pete Sampras	3
Mar-96	Thomas Muster	5
Apr-96	Pete Sampras	102
Mar-98	Marcelo Rios (14)	4
Apr-98	Pete Sampras	15
Aug-98	Marcelo Rios	2
Aug-98	Pete Sampras	20
Mar-99	Carlos Moya (15)	2
Mar-99	Pete Sampras	5
May-99	Yevgeny Kafelnikov (16)	6
Jun-99	Pete Sampras	3
Jul-99	Andre Agassi	3
Jul-99	Patrick Rafter (17)	1
Aug-99	Pete Sampras	6
Sep-99	Andre Agassi	52
Sep-00	Pete Sampras	10
Nov-00	Marat Safin (18)	2
Dec-00	Gustavo Kuerten (19)	8
Jan-01	Marat Safin	4
Feb-01	Gustavo Kuerten	5
Apr-01	Marat Safin	3
Apr-01	Gustavo Kuerten	30
Nov-01	Lleyton Hewitt (20)	75
Apr-03	Andre Agassi	2
May-03	Lleyton Hewitt	5
Jun-03	Andre Agassi	12
Sep-03	Juan Carlos Ferrero (21)	8
Nov-03	Andy Roddick (22)	13
Feb-04	Roger Federer(23)	194 wks as of Jul-07
Note: Bold indicates player's first time at #1

Women
Date	Player	Weeks
3-Nov-75	Chris Evert	140
10-Jul-78	Martina Navratilova	26
14-Jan-79	Chris Evert	2
28-Jan-79	Martina Navratilova	4
25-Feb-79	Chris Evert	7
16-Apr-79	Martina Navratilova	10
25-Jun-79	Chris Evert	11
10-Sep-79	Martina Navratilova	31
7-Apr-80	Tracy Austin	2
21-Apr-80	Martina Navratilova	10
1-Jul-80	Tracy Austin	20
18-Nov-80	Chris Evert	76
3-May-82	Martina Navratilova	2
17-May-82	Chris Evert	4
14-Jun-82	Martina Navratilova	156
10-Jun-85	Chris Evert	18
14-Oct-85	Martina Navratilova	2
28-Oct-85	Chris Evert	4
25-Nov-85	Martina Navratilova	90
17-Aug-87	Steffi Graf	186
11-Mar-91	Monica Seles	21
5-Aug-91	Steffi Graf	1
12-Aug-91	Monica Seles	1
19-Aug-91	Steffi Graf	3
9-Sep-91	Monica Seles	91
7-Jun-93	Steffi Graf	87
6-Feb-95	Arantxa Sanchez-Vicario	2
20-Feb-95	Steffi Graf	1
27-Feb-95	Arantxa Sanchez-Vicario	6
10-Apr-95	Steffi Graf	5
15-May-95	Arantxa Sanchez-Vicario	4
12-Jun-95	Steffi Graf	9
15-Aug-95	Steffi Graf / Monica Seles (co-number 1s)	64
4-Nov-96	Steffi Graf	2
18-Nov-96	Steffi Graf / Monica Seles (co-number 1s)	1
25-Nov-96	Steffi Graf	18
>31-Mar-97	Martina Hingis	80
12-Oct-98	Lindsay Davenport	17
8-Feb-99	Martina Hingis	21
5-Jul-99	Lindsay Davenport	5
9-Aug-99	Martina Hingis	34
3-Apr-00	Lindsay Davenport	5
8-May-00	Martina Hingis	1
15-May-00	Lindsay Davenport	1
22-May-00	Martina Hingis	73
15-Oct-01	Jennifer Capriati	3
5-Nov-01	Lindsay Davenport	10
14-Jan-02	Jennifer Capriati	6
25-Feb-02	Venus Williams	3
18-Mar-02	Jennifer Capriati	5
22-Apr-02	Venus Williams	4
20-May-02	Jennifer Capriati	3
10-Jun-02	Venus Williams	4
8-Jul-02	Serena Williams	57
11-Aug-03	Kim Clijsters	10
20-Oct-03	Justine Henin-Hardenne	1
27-Oct-03	Kim Clijsters	2
10-Nov-03	Justine Henin-Hardenne	43
13-Sep-04	Amelie Mauresmo	5
18-Oct-04	Lindsay Davenport	7 wks as of 30-Nov-04