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 | Opponent | Score | Loss | Save |
| --- | --- | --- | --- | --- |
| May 1 | Giants | 4 - 3 | Garrelts (0-1) | &#124;&#124; 14,490 &#124;&#124;13-6&#124;&#124; |
| May 3 | Padres | 6 - 5 | Sutcliffe (3-3) | Gossage (7) |
| May 4 | Padres | 12 - 8 | Booker (0-1) | Smith (6) |
| May 5 | Padres | 6 - 3 | DeLeón (0-2) | &#124;&#124; 36,388 &#124;&#124;15-7&#124;&#124; |
| May 6 | Dodgers | 5 - 4 10 | Fontenot (0-1) | &#124;&#124; 20,796 &#124;&#124;15-8&#124;&#124; |
| May 7 | Dodgers | 4 - 2 | Brennan (1-2) | Smith (7) |
| May 8 | @ Giants | 1 - 0 | Krukow (2-2) | &#124;&#124; 16,134 &#124;&#124;17-8&#124;&#124; |
| May 9 | @ Giants | 1 - 0 12 | Brusstar (0-1) | &#124;&#124; 11,825 &#124;&#124;17-9&#124;&#124; |
| May 10 | @ Padres | 6 - 2 | Hoyt (2-3) | Smith (8) |
| May 11 | @ Padres | 3 - 1 | Eckersley (4-2) | Gossage (8) |
| May 12 | @ Padres | 5 - 3 | Ruthven (1-2) | Gossage (9) |
| May 14 | @ Dodgers | 8 - 3 | Valenzuela (3-4) | &#124;&#124; 48,187 &#124;&#124;19-11&#124;&#124; |
| May 15 | @ Dodgers | 3 - 2 | Honeycutt (2-3) | Smith (9) |
| May 17 | @ Braves | 7 - 5 | Sutter (2-1) | &#124;&#124; 20,901 &#124;&#124;21-11&#124;&#124; |
| May 18 | @ Braves | 4 - 3 | Eckersley (4-3) | Sutter (7) |
| May 19 | @ Braves | 3 - 0 | Sutcliffe (5-4) | Sutter (8) |
| May 20 | Reds | 6 - 1 | Tibbs (3-6) | &#124;&#124; 21,231 &#124;&#124;22-13&#124;&#124; |
| May 21 | Reds | 5 - 2 | Frazier (2-1) | Power (8) |
| May 22 | Reds | 7 - 4 | Browning (4-3) | Smith (10) |
| May 24 | Astros | 6 - 2 | Ruthven (1-3) | &#124;&#124; 35,743 &#124;&#124;23-15&#124;&#124; |
| May 25 | Astros | 5 - 4 | Ross (0-1) | &#124;&#124; 36,278 &#124;&#124;24-15&#124;&#124; |
| May 26 | Astros | 10 - 8 | Ross (0-2) | Smith (11) |
| May 27 | @ Reds | 4 - 3 | Browning (4-4) | Smith (12) |
| May 28 | @ Reds | 13 - 11 | Sorensen (1-1) | &#124;&#124; 15,121 &#124;&#124;26-16&#124;&#124; |
| May 29 | @ Reds | 1 - 0 | Ruthven (1-4) | &#124;&#124; 18,402 &#124;&#124;26-17&#124;&#124; |
| May 31 | @ Astros | 6 - 2 10 | Smith (4-2) | &#124;&#124; 33,440 &#124;&#124;27-17&#124;&#124; |
Question:
What Opponent played on the Date May 21?
Answer:
Reds