[Apophis]

Recently, much attention has been given to the dominance of a small group of very good players. In contrast, the years 2002-2003 are famous for having 8 different Slam champions, without anyone dominating. I looked up the most non-dominant periods in all of tennis history according to the criterion of consecutive Slam streaks with different winners or finalists. In early times, players usually didn't play in each of the four Slams, making it easier to reach a longer streak, which creates a bias.

I'll provide Open Era-only stats and individual-Slam stats in the next two posts (the latter is not suffering from the above-mentioned bias).

Notes:
Listed streaks can overlap.
Aus 1977J and Aus 1977D indicate the January and December edition

Different Slam Champions:

1		10	(USA 1905 - Aus 1908)
2		8	(Fre 1900 - Wim 1902)
3		8	(Wim 1913 - USA 1915)
4		8	(Aus 1930 - USA 1931)
5		8	(Wim 1975 - Fre 1977)
6		8	(Wim 2000 - Fre 2002)
7		8	(Aus 2002 - USA 2003)
8		7	(Fre 1892 - Fre 1894)
9		7	(Wim 1895 - Wim 1897)
10		7	(Aus 1909 - Wim 1910)
11		7	(USA 1918 - Wim 1920)
12		7	(Aus 1922 - Wim 1923)
13		7	(Fre 1947 - Aus 1949)
14		7	(USA 1974 - Fre 1976)
15		7	(Aus 1990 - Wim 1991)
16		6	(Wim 1889 - Wim 1891)
17		6	(USA 1903 - Fre 1905)
18		6	(USA 1904 - Aus 1906)
19		6	(Aus 1910 - Fre 1911)
20		6	(Aus 1911 - Fre 1912)
21		6	(USA 1911 - Aus 1913)
22		6	(Aus 1923 - Fre 1924)
23		6	(USA 1925 - Aus 1927)
24		6	(Aus 1940 - USA 1944)
25		6	(USA 1945 - Aus 1947)
26		6	(USA 1958 - Aus 1960)
27		6	(Aus 1982 - Fre 1984)
28		6	(Aus 1998 - Fre 1999)

Consecutive Slams with different finalists:

1		7	(Wim 1906 - Aus 1908)
2		6	(Aus 1998 - Fre 1999)
3		6	(Aus 2001 - Fre 2002)
4		5	(USA 1903 - Aus 1905)
5		5	(Aus 1905 - Aus 1906)
6		5	(Aus 1906 - Aus 1907)
7		5	(Aus 1908 - Aus 1909)
8		5	(Aus 1909 - Aus 1910)
9		5	(Aus 1911 - Aus 1912)
10		5	(Aus 1912 - Aus 1913)
11		5	(Aus 1914 - Aus 1915)
12		5	(Aus 1919 - Fre 1920)
13		5	(Fre 1922 - Fre 1923)
14		5	(Fre 1931 - Fre 1932)
15		5	(USA 1945 - USA 1946)
16		5	(Fre 1997 - Fre 1998)

Different runner-ups: (less important than the above lists, but anyway):

1		20	(Fre 1996 - Aus 2001)
2		16	(USA 1904 - Wim 1908)
3		12	(USA 1899 - Wim 1903)
4		12	(Wim 1998 - Fre 2001)
5		11	(USA 1910 - Fre 1913)
6		11	(Aus 1912 - Wim 1914)
7		11	(Aus 1919 - USA 1921)
8		11	(Aus 1921 - Wim 1923)
9		11	(Aus 1972 - Wim 1974)
10		11	(Aus 2001 - Wim 2003)
11		10	(Wim 1888 - Fre 1892)
12		10	(USA 1895 - USA 1898)
13		10	(Wim 1908 - USA 1910)
14		10	(USA 1937 - Aus 1940)
15		10	(Aus 1970 - Fre 1972)
16		10	(Wim 1993 - USA 1995)
17		10	(Wim 2002 - USA 2004)

Updated after Wimbledon 2012

[Apophis]

Now for the Open Era, including information on semifinalists and quarterfinalists.

Different Slam Champions:

1		8	(Wim 1975 - Fre 1977)
2		8	(Wim 2000 - Fre 2002)
3		8	(Aus 2002 - USA 2003)
4		7	(USA 1974 - Fre 1976)
5		7	(Aus 1990 - Wim 1991)
6		6	(Aus 1982 - Fre 1984)
7		6	(Aus 1998 - Fre 1999)
8		5	(USA 1969 - USA 1970)
9		5	(Fre 1971 - Fre 1972)
10		5	(Aus 1972 - Aus 1973)
11		5	(Fre 1973 - Fre 1974)
12		5	(Wim 1988 - Wim 1989)
13		5	(USA 1989 - USA 1990)
14		5	(USA 1990 - USA 1991)
15		5	(Wim 1992 - Wim 1993)
16		5	(Fre 1997 - Fre 1998)
17		4	(Aus 1971 - USA 1971)
18		4	(USA 1976 - Wim 1977)
19		4	(USA 1981 - Wim 1982)
20		4	(USA 1982 - Wim 1983)
21		4	(USA 1983 - Wim 1984)
22		4	(Fre 1985 - Aus 1985)
23		4	(USA 1995 - Wim 1996)
24		4	(Aus 1996 - USA 1996)
25		4	(USA 1997 - Wim 1998)
26		4	(USA 1998 - Wim 1999)
27		4	(Aus 2000 - USA 2000)
28		4	(Fre 2000 - Aus 2001)

Consecutive Slams with different finalists:

1		6	(Aus 1998 - Fre 1999)
2		6	(Aus 2001 - Fre 2002)
3		5	(Fre 1997 - Fre 1998)
4		4	(USA 1969 - Wim 1970)
5		4	(USA 1975 - Wim 1976)
6		4	(USA 1982 - Wim 1983)
7		4	(Aus 1982 - USA 1983)
8		4	(USA 1995 - Wim 1996)
9		4	(USA 1997 - Wim 1998)
10		4	(USA 2000 - Wim 2001)
11		4	(Aus 2002 - USA 2002)

Consecutive Slams with different semifinalists:

1		4	(USA 1997 - Wim 1998)
2		3	(Aus 1973 - Wim 1973)
3		3	(USA 1973 - Fre 1974)
4		3	(USA 1975 - Fre 1976)
5		3	(USA 1981 - Fre 1982)
6		3	(USA 1982 - Fre 1983)
7		3	(Aus 1982 - Wim 1983)
8		3	(Aus 1996 - Wim 1996)
9		3	(Wim 1997 - Aus 1998)
10		3	(USA 1998 - Fre 1999)
11		3	(Fre 2001 - USA 2001)

Consecutive Slams with different quarterfinalists:

1		2	(Fre 1970 - Wim 1970)
2		2	(USA 1971 - Aus 1972)
3		2	(USA 1972 - Aus 1973)
4		2	(Aus 1973 - Fre 1973)
5		2	(Aus 1974 - Fre 1974)
6		2	(Fre 1974 - Wim 1974)
7		2	(Aus 1975 - Fre 1975)
8		2	(USA 1975 - Aus 1976)
9		2	(Aus 1976 - Fre 1976)
10		2	(USA 1977 - Aus 1977D)
11		2	(Aus 1977D - Fre 1978)
12		2	(USA 1978 - Aus 1978)
13		2	(USA 1979 - Aus 1979)
14		2	(USA 1980 - Aus 1980)
15		2	(Aus 1980 - Fre 1981)
16		2	(USA 1981 - Aus 1981)
17		2	(USA 1982 - Aus 1982)
18		2	(Aus 1982 - Fre 1983)
19		2	(Aus 1990 - Fre 1990)
20		2	(Aus 1997 - Fre 1997)
21		2	(Fre 1997 - Wim 1997)
22		2	(Fre 1998 - Wim 1998)
23		2	(Aus 1999 - Fre 1999)
24		2	(Fre 2000 - Wim 2000)
25		2	(Fre 2002 - Wim 2002)
26		2	(Fre 2003 - Wim 2003)

Different runner-ups:

1		20	(Fre 1996 - Aus 2001)
2		12	(Wim 1998 - Fre 2001)
3		11	(Aus 1972 - Wim 1974)
4		11	(Aus 2001 - Wim 2003)
5		10	(Aus 1970 - Fre 1972)
6		10	(Wim 1993 - USA 1995)
7		10	(Wim 2002 - USA 2004)
8		9	(Wim 1971 - Wim 1973)
9		9	(Aus 1977D - Aus 1979)
10		8	(Aus 1991 - USA 1992)
11		7	(USA 1968 - Fre 1970)
12		7	(USA 1975 - Fre 1977)
13		7	(Aus 1976 - Wim 1977)
14		7	(Wim 1985 - Aus 1987)
15		7	(USA 1987 - Fre 1989)
16		7	(Aus 2005 - Wim 2006)

Consecutive Slams with different losing semifinalists:

1		9	(Fre 1997 - Fre 1999)
2		8	(Aus 1999 - USA 2000)
3		7	(Fre 1991 - USA 1992)

Consecutive Slams with different losing quarterfinalists:

1		5	(USA 1982 - USA 1983)

[Apophis]

This post is about all-time results again, with the longest streaks of winners and finalists in each Slam separately.

Note that some long streaks include gaps due to world wars, making it easier to have a longer streak.


Different Slam Champions:

1		13	(1938 - 1956)	Wimbledon
2		10	(1907 - 1919)	Australian
3		10	(1963 - 1972)	US
4		8	(1935 - 1948)	French
5		8	(1968 - 1975)	US
6		7	(1925 - 1931)	Australian
7		7	(1914 - 1925)	French
8		7	(1964 - 1970)	French
9		7	(1928 - 1934)	Wimbledon
10		7	(1962 - 1968)	US
11		7	(1998 - 2004)	US
12		6	(1934 - 1939)	Australian
13		6	(1974 - 1978)	Australian
14		6	(1994 - 1999)	French
15		6	(1971 - 1976)	Wimbledon
16		6	(1954 - 1959)	US
17		5	(1915 - 1922)	Australian
18		5	(1950 - 1954)	Australian
19		5	(1967 - 1971)	Australian
20		5	(1995 - 1999)	Australian
21		5	(1996 - 2000)	Australian
22		5	(1931 - 1935)	French
23		5	(1955 - 1959)	French
24		5	(1962 - 1966)	French
25		5	(1987 - 1991)	French
26		5	(2001 - 2005)	French
27		5	(1887 - 1891)	Wimbledon
28		5	(1921 - 1925)	Wimbledon
29		5	(1957 - 1961)	Wimbledon
30		5	(1989 - 1993)	Wimbledon
31		5	(1902 - 1906)	US
32		5	(1903 - 1907)	US
33		5	(1927 - 1931)	US
34		5	(1940 - 1944)	US
35		5	(1987 - 1991)	US
36		4	(1905 - 1908)	Australian
37		4	(1937 - 1940)	Australian
38		4	(1946 - 1949)	Australian
39		4	(1954 - 1957)	Australian
40		4	(1958 - 1961)	Australian
41		4	(1993 - 1996)	Australian
42		4	(2002 - 2005)	Australian
43		4	(1891 - 1894)	French
44		4	(1900 - 1903)	French
45		4	(1923 - 1926)	French
46		4	(1960 - 1963)	French
47		4	(1971 - 1974)	French
48		4	(1981 - 1984)	French
49		4	(1894 - 1897)	Wimbledon
50		4	(1913 - 1920)	Wimbledon
51		4	(1965 - 1968)	Wimbledon
52		4	(2000 - 2003)	Wimbledon
53		4	(1960 - 1963)	US
54		4	(2008 - 2011)	US

Consecutive Slams with different finalists:

1		8	(1938 - 1951)	Wimbledon
2		6	(1936 - 1947)	French
3		5	(1912 - 1919)	Australian
4		5	(1915 - 1922)	Australian
5		5	(1995 - 1999)	French
6		4	(1905 - 1908)	Australian
7		4	(1911 - 1914)	Australian
8		4	(1927 - 1930)	Australian
9		4	(1996 - 1999)	Australian
10		4	(1921 - 1924)	Wimbledon
11		4	(1929 - 1932)	Wimbledon
12		4	(1965 - 1968)	Wimbledon
13		3	(1907 - 1909)	Australian
14		3	(1908 - 1910)	Australian
15		3	(1921 - 1923)	Australian
16		3	(1967 - 1969)	Australian
17		3	(1968 - 1970)	Australian
18		3	(1972 - 1974)	Australian
19		3	(1976 - 1977D)	Australian
20		3	(1979 - 1981)	Australian
21		3	(1900 - 1902)	French
22		3	(1922 - 1924)	French
23		3	(1952 - 1954)	French
24		3	(1957 - 1959)	French
25		3	(1963 - 1965)	French
26		3	(1972 - 1974)	French
27		3	(1988 - 1990)	French
28		3	(1994 - 1996)	French
29		3	(1998 - 2000)	French
30		3	(2003 - 2005)	French
31		3	(1951 - 1953)	Wimbledon
32		3	(1972 - 1974)	Wimbledon
33		3	(1991 - 1993)	Wimbledon
34		3	(2001 - 2003)	Wimbledon
35		3	(1929 - 1931)	US
36		3	(1941 - 1943)	US
37		3	(1949 - 1951)	US
38		3	(1963 - 1965)	US
39		3	(1967 - 1969)	US
40		3	(1970 - 1972)	US
41		3	(1972 - 1974)	US
42		3	(1989 - 1991)	US
43		3	(1998 - 2000)	US
44		3	(2002 - 2004)	US

Different runner-ups:

1		16	(1929 - 1944)	US
2		15	(1968 - 1981)	Australian
3		14	(1928 - 1947)	French
4		12	(1966 - 1977)	French
5		12	(1911 - 1926)	Wimbledon
6		11	(1993 - 2003)	Australian
7		10	(1991 - 2000)	French
8		9	(1937 - 1951)	Wimbledon
9		9	(1965 - 1973)	Wimbledon
10		9	(1894 - 1902)	US
11		9	(1952 - 1960)	US
12		9	(1961 - 1969)	US
13		9	(1991 - 1999)	US
14		8	(1951 - 1958)	Australian
15		8	(2003 - 2010)	Australian
16		8	(1999 - 2006)	French
17		8	(1928 - 1935)	Wimbledon
18		8	(1945 - 1952)	US
19		8	(1993 - 2000)	US
20		7	(1912 - 1921)	Australian
21		7	(1915 - 1924)	Australian
22		7	(1984 - 1990)	French
23		7	(1895 - 1901)	Wimbledon
24		7	(1881 - 1887)	US
25		7	(1907 - 1913)	US
26		7	(2003 - 2009)	US

[Apophis]

5 different winners in the last 5 US OPen, I hadn't though that'd be possible in the Federer/Nadal/Djokovic Era! First time since French Open 2001-2005.