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:
| Date | Tournament | Winning score | Margin of victory | Runner(s)-up |
| --- | --- | --- | --- | --- |
| 16 Mar 1997 | Honda Classic | −14 (68-68-67-71=274) | 1 stroke | Michael Bradley , Payne Stewart |
| 7 Jun 1998 | Kemper Open | −10 (70-63-69-72=274) | 1 stroke | Scott Hoch |
| 2 May 1999 | Shell Houston Open | −9 (70-68-70-71=279) | 1 stroke | John Cook , Hal Sutton |
| 12 Oct 2003 | Las Vegas Invitational | −31 (62-68-63-66-69=328) | Playoff | Scott McCarron |
| 11 Jan 2004 | Mercedes Championships | −22 (66-67-66-71=270) | 1 stroke | Vijay Singh |
| 9 Jan 2005 | Mercedes Championships (2) | −21 (74-64-66-67=271) | 1 stroke | Jonathan Kaye |
| 8 Jan 2006 | Mercedes Championships (3) | −8 (71-72-70-71=284) | Playoff | Vijay Singh |
| 23 Apr 2006 | Shell Houston Open (2) | −19 (66-67-69-67=269) | 6 strokes | Bob Estes |
| 1 Aug 2010 | Greenbrier Classic | −22 (66-68-65–59=258) | 1 stroke | Jeff Overton |
Question:
What is Runner(s)-Up when Margin of Victory is 6 Strokes?
Answer:
Bob Estes