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 | Attendance | Record |
| --- | --- | --- | --- | --- | --- |
| May 1 | New York Mets | 3-6 | Ayala (1-1) | 27333.0 | 13-12 |
| May 2 | @ Los Angeles Dodgers | 6-2 | Erickson (1-3) | 34079.0 | 14-12 |
| May 3 | @ Los Angeles Dodgers | 2-4 | Rauch (0-1) | 41190.0 | 14-13 |
| May 4 | @ Los Angeles Dodgers | 5-2 | Pérez (4-2) | 33081.0 | 15-13 |
| May 6 | @ San Francisco Giants | 9-3 | Lowry (1-3) | 40425.0 | 16-13 |
| May 7 | @ San Francisco Giants | 11-8 | Accardo (0-1) | 40220.0 | 17-13 |
| May 8 | @ San Francisco Giants | 3-4 (13) | Rauch (1-2) | 36903.0 | 17-14 |
| May 9 | @ Arizona Diamondbacks | 4-3 | Valverde (0-1) | 19440.0 | 18-14 |
| May 10 | @ Arizona Diamondbacks | 2-3 | Armas (0-1) | 23181.0 | 18-15 |
| May 11 | @ Arizona Diamondbacks | 2-3 | Rauch (1-3) | 21011.0 | 18-16 |
| May 13 | Chicago Cubs | 3-6 | Ayala (2-2) | 36585.0 | 18-17 |
| May 14 | Chicago Cubs | 4-3 | Zambrano (3-2) | 42829.0 | 19-17 |
| May 15 | Chicago Cubs | 5-4 | Bartosh (0-2) | 44103.0 | 20-17 |
| May 16 | Milwaukee Brewers | 5-2 | Davis (4-5) | 26606.0 | 21-17 |
| May 17 | Milwaukee Brewers | 2-8 | Vargas (0-1) | 26427.0 | 21-18 |
| May 18 | Milwaukee Brewers | 1-0 | Capuano (3-3) | 29216.0 | 22-18 |
| May 19 | Milwaukee Brewers | 3-2 | Santos (1-4) | 30968.0 | 23-18 |
| May 20 | Toronto Blue Jays | 1-6 | Vargas (0-2) | 17465.0 | 23-19 |
| May 21 | Toronto Blue Jays | 0-7 | Armas (1-2) | 24518.0 | 23-20 |
| May 22 | Toronto Blue Jays | 9-2 | Towers (5-2) | 28408.0 | 24-20 |
| May 23 | @ Cincinnati Reds | 3-5 | Loaiza (1-3) | 17630.0 | 24-21 |
| May 24 | @ Cincinnati Reds | 3-4 (15) | Ayala (2-3) | 36539.0 | 24-22 |
| May 25 | @ Cincinnati Reds | 3-12 | Vargass (0-3) | 20497.0 | 24-23 |
| May 27 | @ St. Louis Cardinals | 3-6 | Armas (1-3) | 47383.0 | 24-24 |
| May 28 | @ St. Louis Cardinals | 1-3 | Loaiza (1-4) | 49123.0 | 24-25 |
| May 29 | @ St. Louis Cardinals | 3-2 | Carpenter (7-3) | 47012.0 | 25-25 |
| May 30 | Atlanta Braves | 3-2 | Davies (2-1) | 39705.0 | 26-25 |
| May 31 | Atlanta Braves | 5-4 | Colón (0-2) | 29512.0 | 27-25 |
Question:
Who was the opponent on May 20?
Answer:
Toronto Blue Jays