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:
| Rank | Name | Nationality | Time |
| --- | --- | --- | --- |
|  | Gustavo Borges | Brazil | 1:49.41 |
|  | Scott Tucker | United States | 1:50.99 |
|  | Leonardo Costa | Brazil | 1:51.29 |
|  | Mark Johnston | Canada | 1:51.29 |
| 5 | Nate Boyle | United States | 1:52.83 |
| 6 | Yannick Lupien | Canada | 1:52.92 |
| 7 | Joshua Ilika | Mexico | 1:53.73 |
| 8 | Javier Díaz | Mexico | 1:54.01 |
Question:
who finished before nate boyle for the united states?
Answer:
Mark Johnston