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:
| Outcome | Date | Category | Surface | Opponent | Score |
| --- | --- | --- | --- | --- | --- |
| Winner | 11 May 2009 | Challenger | Clay | Carsten Ball | 6–7 (4–7) , 6–4, 6–3 |
| Runner-up | 24 July 2011 | Challenger | Hard | Wayne Odesnik | 5–7, 4–6 |
| Winner | 7 August 2011 | Challenger | Hard | Robby Ginepri | 7–5, 6–4 |
| Runner-up | 10 February 2013 | Challenger | Hard | Matthew Barton | 2–6, 3–6 |
| Runner-up | 5 May 2013 | Challenger | Clay | Márton Fucsovics | 5–7, 6–3, 3–6 |
| Winner | 28 July 2013 | Challenger | Hard | James Duckworth | 4–6, 6–3, 6–4 |
Question:
What category is Matthew Barton?
Answer:
Challenger