Please read the following table in Markdown format and then answer the question according to the table. Table cells in one row are seperated by '|', and different rows are seperated by '
'.

Table:
| Outcome | Date | Championship | Surface | Opponent | Score |
| --- | --- | --- | --- | --- | --- |
| Winner | 8 April 1991 | Hong Kong, UK | Hard | Wally Masur | 6–2, 3–6, 6–3 |
| Runner-up | 13 April 1992 | Tokyo , Japan | Hard | Jim Courier | 4–6, 4–6, 6–7 (3–7) |
| Winner | 10 August 1992 | Los Angeles , USA | Hard | Mark Woodforde | 6–4, 2–6, 6–4 |
| Winner | 16 November 1992 | Antwerp , Belgium | Carpet (i) | Mark Woodforde | 6–2, 6–2 |
| Runner-up | 22 February 1993 | Stuttgart , Germany | Carpet (i) | Michael Stich | 6–4, 5–7, 6–7 (4–7) , 6–3, 5–7 |
| Winner | 9 August 1993 | Los Angeles, USA | Hard | Michael Chang | 0–6, 7–6 (7–3) , 7–6 (7–5) |
| Winner | 11 April 1994 | Barcelona , Spain | Clay | Carlos Costa | 6–4, 7–6 (8–6) , 6–2 |
| Winner | 13 June 1994 | Rosmalen , Netherlands | Grass | Karsten Braasch | 6–3, 6–4 |
| Winner | 10 October 1994 | Sydney, Australia | Hard (i) | Boris Becker | 7–6 (7–5) , 7–6 (9–7) , 2–6, 6–3 |
| Winner | 27 February 1995 | Stuttgart , Germany | Carpet (i) | Michael Stich | 7–6 (7–4) , 6–3, 6–7 (6–8) , 1–6, 6–3 |
| Winner | 6 March 1995 | Rotterdam , Netherlands | Carpet (i) | Paul Haarhuis | 7–6 (7–5) , 6–4 |
| Runner-up | 21 August 1995 | New Haven , USA | Hard | Andre Agassi | 6–3, 6–7 (2–7) , 3–6 |
| Runner-up | 20 May 1996 | Rome , Italy | Clay | Thomas Muster | 2–6, 4–6, 6–3, 3–6 |
| Winner | 8 July 1996 | Wimbledon , London, UK | Grass | MaliVai Washington | 6–3, 6–4, 6–3 |
| Runner-up | 5 August 1996 | Los Angeles , USA | Hard | Michael Chang | 4–6, 3–6 |
| Winner | 10 March 1997 | Rotterdam, Netherlands | Carpet (i) | Daniel Vacek | 7–6 (7–4) , 7–6 (7–5) |
| Winner | 21 April 1997 | Tokyo , Japan | Hard | Lionel Roux | 6–2, 3–6, 6–1 |
| Winner | 23 June 1997 | Rosmalen, Netherlands | Grass | Guillaume Raoux | 6–4, 7–6 (9–7) |
| Runner-up | 27 October 1997 | Stuttgart, Germany | Carpet (i) | Petr Korda | 6–7 (6–8) , 2–6, 4–6 |
| Winner | 16 February 1998 | St. Petersburg , Russia | Carpet (i) | Marc Rosset | 6–4, 7–6 (7–5) |
| Runner-up | 10 August 1998 | Toronto , Canada | Hard | Patrick Rafter | 6–7 (3–7) , 4–6 |
| Winner | 2 November 1998 | Stuttgart, Germany | Hard (i) | Yevgeny Kafelnikov | 6–4, 6–3, 6–3 |
| Winner | 1 March 1999 | London, UK | Carpet (i) | Greg Rusedski | 7–6 (8–6) , 6–7 (5–7) , 7–5 |
| Winner | 29 March 1999 | Miami , USA | Hard | Sébastien Grosjean | 4–6, 6–1, 6–2, 7–5 |
| Runner-up | 1 November 1999 | Stuttgart, Germany | Hard (i) | Thomas Enqvist | 1–6, 4–6, 7–5, 5–7 |
| Runner-up | 19 June 2000 | Halle , Germany | Grass | David Prinosil | 3–6, 2–6 |
Question:
what is the outcome when the surface is grass on 23 june 1997?
Answer:
Winner