Table:
text: Milan Indoor
Singles
Singles
Location_ Year_ Champion Runner_up Score
Milan 1984 Stefan Edberg Mats Wilander 6–4, 6–2
Milan 1983 Ivan Lendl Kevin Curren 5–7, 6–3, 7–6
Milan 1982 Guillermo Vilas Jimmy Connors 6–3, 6–3
Milan 1981 John McEnroe Björn Borg 7–6, 6–4
Milan 1980 John McEnroe Vijay Amitraj 6–1, 6–4
Milan 1979 John McEnroe John Alexander 6–4, 6–3
Milan 1978 Björn Borg Vitas Gerulaitis 6–3, 6–3

text: Milan Indoor
Singles
Singles
Location_ Year_ Champion Runner_up Score
Milan 2005 Robin Söderling Radek Štěpánek 6–3, 6–7 (2–7) , 7–6 (7–5)
Milan 2004 Antony Dupuis Mario Ančić 6–4, 6–7 (12–14) , 7–6 (7–5)
Milan 2003 Martin Verkerk Yevgeny Kafelnikov 6–4, 5–7, 7–5
Milan 2002 Davide Sanguinetti Roger Federer 7–6 (7–2) , 4–6, 6–1
Milan 2001 Roger Federer Julien Boutter 6–4, 6–7 (7–9) , 6–4
London 2000 Marc Rosset Yevgeny Kafelnikov 6–4, 6–4
London 1999 Richard Krajicek Greg Rusedski 7–6 (8–6) , 6–7 (5–7) , 7–5
London 1998 Yevgeny Kafelnikov Cédric Pioline 7–5, 6–4
Milan 1997 Goran Ivanišević Sergi Bruguera 6–2, 6–2

text: Milan Indoor
Singles
Singles
Location_ Year_ Champion Runner_up Score
Milan 1996 Goran Ivanišević Marc Rosset 6–3, 7–6 (7–3)
Milan 1995 Yevgeny Kafelnikov Boris Becker 7–5, 5–7, 7–6 (8–6)
Milan 1994 Boris Becker Petr Korda 6–2, 3–6, 6–3
Milan 1993 Boris Becker Sergi Bruguera 6–3, 6–3
Milan 1992 Omar Camporese Goran Ivanišević 3–6, 6–3, 6–4
Milan 1991 Alexander Volkov Cristiano Caratti 6–1, 7–5
Milan 1990 Ivan Lendl Tim Mayotte 6–3, 6–2
Milan 1989 Boris Becker Alexander Volkov 6–1, 6–2
Milan 1988 Yannick Noah Jimmy Connors 4–4 retired
Milan 1987 Boris Becker Miloslav Mečíř 6–4, 6–3
Milan 1986 Ivan Lendl Joakim Nyström 6–2, 6–2, 6–4
Milan 1985 John McEnroe Anders Järryd 6–4, 6–1

Question: When was the earliest year at Milan Indoor that Guillermo Vilas became champion?