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 | 4 August 1986 | Hilversum | Clay | Jakob Hlasek | 6–1, 6–3, 6–3 |
| Winner | 11 July 1988 | Boston | Clay | Lawson Duncan | 6–2, 6–2 |
| Winner | 1 August 1988 | Bordeaux | Clay | Ronald Agénor | 6–3, 6–3 |
| Winner | 15 August 1988 | Prague | Clay | Guillermo Pérez-Roldán | 6–4, 5–7, 6–2 |
| Runner-up | 19 September 1988 | Barcelona | Clay | Kent Carlsson | 3–6, 3–6, 6–3, 1–6 |
| Winner | 26 September 1988 | Bari | Clay | Marcelo Filippini | 2–6, 6–1, 7–5 |
| Runner-up | 24 October 1988 | Vienna | Carpet | Horst Skoff | 6–4, 3–6, 4–6, 2–6 |
| Runner-up | 3 April 1989 | Miami | Hard | Ivan Lendl | W/O |
| Winner | 8 January 1990 | Adelaide | Hard | Jimmy Arias | 3–6, 6–2, 7–5 |
| Winner | 12 March 1990 | Casablanca | Clay | Guillermo Pérez-Roldán | 6–1, 6–7 (6–8) , 6–2 |
| Runner-up | 30 April 1990 | Monte Carlo | Clay | Andrei Chesnokov | 5–7, 3–6, 3–6 |
| Runner-up | 7 May 1990 | Munich | Clay | Karel Nováček | 4–6, 2–6 |
| Winner | 21 May 1990 | Rome | Clay | Andrei Chesnokov | 6–1, 6–3, 6–1 |
| Winner | 17 June 1991 | Florence | Clay | Horst Skoff | 6–2, 6–7 (2–7) , 6–2 |
| Winner | 16 September 1991 | Geneva | Clay | Horst Skoff | 6–2, 6–4 |
| Winner | 27 April 1992 | Monte Carlo | Clay | Aaron Krickstein | 6–3, 6–1, 6–3 |
| Winner | 15 June 1992 | Florence | Clay | Renzo Furlan | 6–3, 1–6, 6–1 |
| Winner | 31 August 1992 | Umag | Clay | Franco Davín | 6–1, 4–6, 6–4 |
| Runner-up | 18 January 1993 | Sydney | Hard | Pete Sampras | 6–7 (7–9) , 1–6 |
| Winner | 1 March 1993 | Mexico City | Clay | Carlos Costa | 6–2, 6–4 |
| Winner | 14 June 1993 | Florence | Clay | Jordi Burillo | 6–1, 7–5 |
| Winner | 21 June 1993 | Genova | Clay | Magnus Gustafsson | 7–6 (7–3) , 6–4 |
| Winner | 9 August 1993 | Kitzbühel | Clay | Javier Sánchez | 6–3, 7–5, 6–4 |
| Winner | 16 August 1993 | San Marino | Clay | Renzo Furlan | 7–5, 7–5 |
| Winner | 30 August 1993 | Umag | Clay | Alberto Berasategui | 7–5, 3–6, 6–3 |
| Winner | 3 October 1993 | Palermo | Clay | Sergi Bruguera | 7–6 (7–2) , 7–5 |
| Runner-up | 25 October 1993 | Vienna | Carpet | Goran Ivanišević | 6–4, 4–6, 4–6, 6–7 (3–7) |
| Winner | 28 February 1994 | Mexico City | Clay | Roberto Jabali | 6–3, 6–1 |
| Winner | 2 May 1994 | Madrid | Clay | Sergi Bruguera | 6–2, 3–6, 6–4, 7–5 |
| Winner | 20 June 1994 | Sankt Pölten | Clay | Tomás Carbonell | 4–6, 6–2, 6–4 |
| Winner | 6 March 1995 | Mexico City | Clay | Fernando Meligeni | 7–6 (7–4) , 7–5 |
| Winner | 10 April 1995 | Estoril | Clay | Albert Costa | 6–4, 6–2 |
| Winner | 17 April 1995 | Barcelona | Clay | Magnus Larsson | 6–2, 6–1, 6–4 |
| Winner | 1 May 1995 | Monte Carlo | Clay | Boris Becker | 4–6, 5–7, 6–1, 7–6 (8–6) , 6–0 |
| Winner | 22 May 1995 | Rome | Clay | Sergi Bruguera | 3–6, 7–6 (7–5) , 6–2, 6–3 |
| Winner | 12 June 1995 | French Open | Clay | Michael Chang | 7–5, 6–2, 6–4 |
| Winner | 26 June 1995 | Sankt Pölten | Clay | Bohdan Ulihrach | 6–3, 3–6, 6–1 |
| Winner | 24 July 1995 | Stuttgart Outdoor | Clay | Jan Apell | 6–2, 6–2 |
| Runner-up | 7 August 1995 | Kitzbühel | Clay | Albert Costa | 6–4, 4–6, 6–7 (3–7) , 6–2, 4–6 |
| Winner | 14 August 1995 | San Marino | Clay | Andrea Gaudenzi | 6–2, 6–0 |
| Winner | 28 August 1995 | Umag | Clay | Carlos Costa | 3–6, 7–6 (7–5) , 6–4 |
| Winner | 18 September 1995 | Bucharest | Clay | Gilbert Schaller | 6–4, 6–3 |
| Runner-up | 23 October 1995 | Vienna | Carpet | Filip Dewulf | 5–7, 2–6, 6–1, 5–7 |
| Winner | 30 October 1995 | Essen | Carpet | MaliVai Washington | 7–6 (8–6) , 2–6, 6–3, 6–4 |
| Winner | 11 March 1996 | Mexico City | Clay | Jiří Novák | 7–6 (7–3) , 6–2 |
| Winner | 15 April 1996 | Estoril | Clay | Andrea Gaudenzi | 7–6 (7–4) , 6–4 |
| Winner | 22 April 1996 | Barcelona | Clay | Marcelo Ríos | 6–3, 4–6, 6–4, 6–1 |
| Winner | 29 April 1996 | Monte Carlo | Clay | Albert Costa | 6–3, 5–7, 4–6, 6–3, 6–2 |
| Winner | 20 May 1996 | Rome | Clay | Richard Krajicek | 6–2, 6–4, 3–6, 6–3 |
| Winner | 22 July 1996 | Stuttgart Outdoor | Clay | Yevgeny Kafelnikov | 6–2, 6–2, 6–4 |
| Winner | 16 September 1996 | Bogotá | Clay | Nicolás Lapentti | 6–7 (6–8) , 6–2, 6–3 |
| Winner | 17 February 1997 | Dubai | Hard | Goran Ivanišević | 7–5, 7–6 (7–3) |
| Winner | 31 March 1997 | Miami | Hard | Sergi Bruguera | 7–6 (8–6) , 6–3, 6–1 |
| Runner-up | 11 August 1997 | Cincinnati | Hard | Pete Sampras | 3–6, 4–6 |
| Runner-up | 13 April 1998 | Estoril | Clay | Alberto Berasategui | 6–3, 1–6, 3–6 |
Question:
What is the surface on 21 june 1993?
Answer:
Clay