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:
| Year | Date Final | Venue | Prize Money | Champion | Runner-up | Score in final | Commercial name |
| --- | --- | --- | --- | --- | --- | --- | --- |
| 1989 | Apr 26-30 | Atlanta | $500,000 | Andre Agassi | Michael Chang | 6–3, 6–2 | AT&T Challenge of Champions |
| 1988 | Apr 28-May 1 | Atlanta | $500,000 | Ivan Lendl | Stefan Edberg | 2–6, 6–1, 6–3 | AT&T Challenge of Champions |
| 1987 | Oct 6-11 | Atlanta | $500,000 | John McEnroe | Paul Annacone | 6–4, 7–5 | AT&T Challenge of Champions |
| *1986 | Nov 25-30 | Atlanta | $500,000 | Boris Becker | John McEnroe | 3–6, 6–3, 7–5 | AT&T Challenge of Champions |
| 1986 | Jan 6-12 | Atlanta | $500,000 | Ivan Lendl | Jimmy Connors | 6–2, 6–3 | AT&T Challenge of Champions |
| 1985 | Jan 1-6 | Las Vegas | $1,290,000 | John McEnroe | Guillermo Vilas | 7–5, 6–0 | AT&T Challenge of Champions |
| 1984 | Jan 3-8 | Rosemont | $250,000 | Jimmy Connors | Andrés Gómez | 6–3, 6–2, 6–1 | Lite Challenge of Champions |
| 1983 | Jan 4-9 | Rosemont | $250,000 | Ivan Lendl | Jimmy Connors | 4–6, 6–4, 7–5, 6–4 | Lite Challenge of Champions |
| 1982 | Jan 6-11 | Rosemont | $310,000 | Jimmy Connors | John McEnroe | 6–7, 7–5, 6–7, 7–5, 6–4 | Michelob Light Challenge of Champions |
| 1981 | Jan 7-12 | Rosemont | $310,000 | John McEnroe | Jimmy Connors | 6–2, 6–4, 6–1 | Challenge of Champions |
Question:
What champion has 1981 as the year?
Answer:
John McEnroe