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 | Record |
| --- | --- | --- | --- | --- |
| May 1 | Rangers | 10 - 4 | Tanana (2-3) | 14-9 |
| May 1 | Rangers | 4 - 1 | Alexander (1-1) | 14-10 |
| May 2 | Rangers | 7 - 6 | Hough (1-4) | 15-10 |
| May 4 | Royals | 4 - 3 (10) | Huismann (0-2) | 16-10 |
| May 5 | Royals | 10 - 1 | Jackson (0-3) | 17-10 |
| May 6 | Royals | 2 - 1 | Gura (4-1) | 18-10 |
| May 7 | @ Orioles | Postponed (wet grounds) Rescheduled for May 10 | Postponed (wet grounds) Rescheduled for May 10 | Postponed (wet grounds) Rescheduled for May 10 |
| May 8 | @ Orioles | Postponed (rain) Rescheduled for May 9 | Postponed (rain) Rescheduled for May 9 | Postponed (rain) Rescheduled for May 9 |
| May 9 | @ Orioles | 7 - 4 | Clancy (2-3) | 18-11 |
| May 9 | @ Orioles | 7 - 3 | Key (2-2) | 18-12 |
| May 10 | @ Orioles | 4 - 3 (10) | Martínez (1-1) | 19-12 |
| May 11 | @ Indians | Postponed (rain) Rescheduled for May 13 | Postponed (rain) Rescheduled for May 13 | Postponed (rain) Rescheduled for May 13 |
| May 12 | @ Indians | 8 - 4 | Acker (0-2) | 19-13 |
| May 13 | @ Indians | 4 - 4 (8) | Postponed (rain) Rescheduled for August 14 | 19-13 |
| May 13 | @ Indians | Postponed (rain) Rescheduled for August 15 | Postponed (rain) Rescheduled for August 15 | Postponed (rain) Rescheduled for August 15 |
| May 15 | @ Twins | 5 - 2 (10) | Davis (2-3) | 20-13 |
| May 16 | @ Twins | 8 - 7 | Filson (3-1) | 21-13 |
| May 17 | White Sox | 3 - 2 | Hoyt (3-5) | 22-13 |
| May 18 | White Sox | 4 - 3 | Burns (2-2) | 23-13 |
| May 19 | White Sox | 1 - 0 | Seaver (4-3) | 24-13 |
| May 20 | White Sox | 3 - 0 | Stieb (5-1) | 24-14 |
| May 21 | Twins | 3 - 2 | Davis (2-4) | 25-14 |
| May 22 | Twins | 3 - 2 | Smithson (6-4) | 26-14 |
| May 23 | Twins | 4 - 1 | Viola (4-5) | 27-14 |
| May 25 | Indians | 5 - 1 | Heaton (2-4) | 28-14 |
| May 26 | Indians | 2 - 1 | Farr (0-3) | 29-14 |
| May 27 | Indians | 6 - 1 | Sutcliffe (3-4) | 30-14 |
| May 27 | Indians | 6 - 5 | Camacho (1-4) | 31-14 |
| May 28 | @ White Sox | Postponed (rain) Rescheduled for August 30 | Postponed (rain) Rescheduled for August 30 | Postponed (rain) Rescheduled for August 30 |
| May 29 | @ White Sox | 8 - 1 | Clancy (4-4) | 31-15 |
| May 30 | @ White Sox | 2 - 1 | Burns (2-4) | 32-15 |
Question:
What was the loss of the game when the record was 21-13?
Answer:
Filson (3-1)