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:
| Competition | Round | Opponent | Result | Score | Home/Away | Venue | Attendance | Date |
| --- | --- | --- | --- | --- | --- | --- | --- | --- |
| Friendly | N/A | Warrington Wolves | Lose | 30-22 | Away | Halliwell Jones Stadium | 6,573 | 13 Jan 2008 |
| Friendly | N/A | Bradford Bulls | Win | 16-28 | Away | Grattan Stadium | 5,036 | 20 Jan 2008 |
| Friendly | N/A | Widnes Vikings | Win | 18-42 | Away | Halton Stadium | 5,106 | 27 Jan 2008 |
| Super League XIII | 1 | Harlequins RL | Win | 28-47 | Away | Twickenham Stoop | 8,041 | 9 Feb 2008 |
| Super League XIII | 2 | Castleford Tigers | Win | 28-16 | Home | JJB Stadium | 16,667 | 15 Feb 2008 |
| Super League XIII | 3 | Hull | Lose | 24-22 | Away | KC Stadium | 13,226 | 22 Feb 2008 |
| Super League XIII | 4 | Bradford Bulls | Win | 28-14 | Home | JJB Stadium | 15,444 | 1 Mar 2008 |
| Super League XIII | 5 | Warrington Wolves | Lose | 32-20 | Away | Halliwell Jones Stadium | 13,024 | 8 Mar 2008 |
| Super League XIII | 6 | Huddersfield Giants | Win | 19-20 | Away | Galpharm Stadium | 8,417 | 16 Mar 2008 |
| Super League XIII | 7 | St. Helens | Lose | 46-10 | Away | Knowsley Road | 17,500 | 21 Mar 2008 |
| Super League XIII | 8 | Hull Kingston Rovers | Win | 18-12 | Home | JJB Stadium | 16,457 | 24 Mar 2008 |
| Super League XIII | 9 | Wakefield Trinity Wildcats | Win | 8-4 | Home | JJB Stadium | 12,933 | 28 Mar 2008 |
| Super League XIII | 10 | Leeds Rhinos | Win | 10-14 | Away | Headingley Carnegie Stadium | 18,769 | 5 Apr 2008 |
| Super League XIII | 11 | Catalans Dragons | Lose | 24-26 | Home | JJB Stadium | 13,044 | 11 Apr 2008 |
| Challenge Cup | Rnd4 | Pia Donkeys | Win | 74 - 4 | Home | JJB Stadium | 4,423 | 20 Apr 2008 |
| Super League XIII | 12 | Bradford Bulls | Lose | 26-12 | Away | Grattan Stadium | 11,894 | 27 Apr 2008 |
| Super League XIII | 13 | St Helens | Lose | 57-16 | Away | Millennium Stadium | 32,516 | 4 May 2008 |
| Challenge Cup | Rnd5 | Whitehaven | Win | 106-8 | Home | JJB Stadium | 3,814 | 12 May 2008 |
| Super League XIII | 14 | Warrington Wolves | Win | 38-14 | Home | JJB Stadium | 15,537 | 16 May 2008 |
| Super League XIII | 15 | Wakefield Trinity Wildcats | Win | 38-30 | Away | Atlantic Solutions Stadium | 6,370 | 25 May 2008 |
| Challenge Cup | QF | Leeds Rhinos | Lose | 23-16 | Away | Headingley Carnegie Stadium | 10,129 | 1 June 2008 |
| Super League XIII | 16 | Huddersfield Giants† | Postponed | N/A | Home | JJB Stadium | N/A | 6 Jun 2008 |
| Super League XIII | 17 | Catalans Dragons | Lose | 45-38 | Away | Stade Gilbert Brutus | 9,125 | 14 Jun 2008 |
| Super League XIII | 18 | Castleford Tigers | Draw | 22-22 | Away | The Jungle | 7,048 | 22 Jun 2008 |
| Super League XIII | 19 | Harlequins RL | Win | 38-20 | Home | JJB Stadium | 11,453 | 27 Jun 2008 |
| Super League XIII | 20 | Leeds Rhinos | Win | 23-22 | Home | JJB Stadium | 14,911 | 5 Jul 2008 |
| Super League XIII | 21 | Hull Kingston Rovers | Lose | 39-22 | Away | Craven Park | 8,481 | 13 Jul 2008 |
| Super League XIII | 22 | St Helens | Lose | 46-12 | Home | JJB Stadium | 19,958 | 18 Jul 2008 |
| Super League XIII | 16 | Huddersfield Giants† | Lose | 34-4 | Home | JJB Stadium | 12,216 | 25 Jul 2008 |
| Super League XIII | 23 | Hull FC | Win | 66-6 | Home | JJB Stadium | 12,842 | 1 Aug 2008 |
| Super League XIII | 24 | Catalans Dragons | Draw | 16-16 | Away | Stade Gilbert Brutus | 9,535 | 9 Aug 2008 |
| Super League XIII | 25 | Wakefield Trinity Wildcats | Win | 32-22 | Home | JJB Stadium | 12,319 | 15 Aug 2008 |
| Super League XIII | 26 | Leeds Rhinos | Lose | 16-52 | Home | JJB Stadium | 14,778 | 22 Aug 2008 |
| Super League XIII | 27 | St. Helens | Draw | 16-16 | Away | Knowsley Road | 14,113 | 5 Sep 2008 |
| Super League XIII Playoffs | Week 1 | Bradford Bulls‡ | Win | 30-14 | Home/Neutral | The Stobart Stadium Halton | 6,806 | 12 Sep 2008 |
| Super League XIII Playoffs | Week 2 | Catalans Dragons | Win | 26-50 | Away | Stade Gilbert Brutus | 9,985 | 20 Sep 2008 |
Question:
Who was the opponent in round 2?
Answer:
Castleford Tigers