Table:
text: Challenge of Champions
Past winners and runners-up
Past winners and runners-up
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

Question: What is the end date for 1989 as the year under the Challenge of Champions?

Question: What is the final standing of Boris Becker as champion at Challenge of Champions?