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:
| Year | Championship | Partner | Opponents in the final | Score |
| --- | --- | --- | --- | --- |
| 1942.0 | U.S. Championships | Gardnar Mulloy | Ted Schroeder Sidney Wood | 9–7, 7–5, 6–1 |
| 1945.0 | U.S. Championships | Gardnar Mulloy | Bob Falkenburg Jack Tuero | 12–10, 8–10, 12–10, 6–2 |
| 1946.0 | U.S. Championships | Gardnar Mulloy | Don McNeill Frank Guernsey | 3–6, 6–4, 2–6, 6–3, 20–18 |
| 1948.0 | U.S. Championships | Gardnar Mulloy | Frank Parker Ted Schroeder | 1–6, 9–7, 6–3, 3–6, 9–7 |
| 1950.0 | French Championships | Tony Trabert | Jaroslav Drobný Eric Sturgess | 6–2, 1–6, 10–8, 6–2 |
Question:
which opponents in the u.s. championships played after 1945 and had a score of 3–6, 6–4, 2–6, 6–3, 20–18?
Answer:
Don McNeill Frank Guernsey