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:
| Result | TUF Competitor | Opponent | Method | Event | Date |
| --- | --- | --- | --- | --- | --- |
| Loss | Joe Stevenson | B.J. Penn | Submission (Rear Naked Choke) at 4:02 of round 2 | UFC 80: Rapid Fire | January 19, 2008 |
| Win | Rashad Evans | Forrest Griffin | TKO (Punches) at 2:46 of round 3 | UFC 92: The Ultimate 2008 | December 27, 2008 |
| Loss | Rashad Evans | Lyoto Machida | KO (Punches) at 3:57 of round 2 | UFC 98: Evans vs. Machida | May 23, 2009 |
| Loss | Keith Jardine | Luke Rockhold | TKO (Punches) at 4:26 of round 1 | Strikeforce: Rockhold vs. Jardine | January 7, 2012 |
| Loss | Rashad Evans | Jon Jones | Decision (Unanimous) | UFC 145: Jones vs. Evans | April 21, 2012 |
Question:
when is the opponent lyoto machida?
Answer:
May 23, 2009