John Thompson Mercer
| Date of birth | 1879 |
| Place of birth | Belfast |
| Nationality | Irish |
| Position | Outside right |
Ireland International.
Club stats
| Season | Team | Competition | Apps | Subs | Goals | Y | R |
|---|---|---|---|---|---|---|---|
| 1897-98 | Ireland | British Home Championship | 3 | ||||
| 1897-98 | Irish League | Inter League | 1 | ||||
| 1898-99 | Ireland | British Home Championship | 1 | ||||
| 1898-99 | Irish League | Inter League | 1 | 2 |
|||
| 1899-00 | Leicester City | League Division Two | 9 | 2 |
|||
| 1901-02 | Ireland | British Home Championship | 2 | ||||
| 1901-02 | Irish League | Inter League | 2 | ||||
| 1902-03 | Ireland | British Home Championship | 2 | ||||
| 1902-03 | Ireland | Ibrox Disaster Fund | 1 | ||||
| 1902-03 | Irish League | Inter League | 1 | ||||
| 1903-04 | Derby County | FA Cup | 6 | ||||
| 1903-04 | Derby County | League Division One | 24 | 1 |
|||
| 1903-04 | Ireland | British Home Championship | 2 | ||||
| 1903-04 | Irish League | Inter League | 1 | ||||
| 1904-05 | Derby County | League Division One | 2 | ||||
| 1904-05 | Ireland | British Home Championship | 1 |
Please note: Career stats are based on performances in the Premier and Football Leagues and (in most cases all) internationals.
Club matches
| Date | Match | Result | Competition | Round | |
|---|---|---|---|---|---|
| 24 Oct 1903 | Liverpool v Derby County | L | 3-1 | League Division One | |
| 31 Oct 1903 | Derby County v Bury | D | 2-2 | League Division One | |
| 07 Nov 1903 | Blackburn Rovers v Derby County | L | 2-1 | League Division One | |
| 14 Nov 1903 | Derby County v Nottingham Forest | L | 2-6 | League Division One | |
| 21 Nov 1903 | Sheffield Wednesday v Derby County | L | 1-0 | League Division One | |
| 28 Nov 1903 | Derby County v Sunderland | W | 7-2 | League Division One | |
| 14 Dec 1903 | West Bromwich Albion v Derby County | D | 0-0 | League Division One | |
| 19 Dec 1903 | Everton v Derby County | W | 0-1 | League Division One | |
| 25 Dec 1903 | Derby County v Liverpool | W | 2-0 | League Division One | |
| 26 Dec 1903 | Derby County v Stoke | W | 5-0 | League Division One | |
| 28 Dec 1903 | Derby County v Aston Villa | D | 2-2 | League Division One | |
| 02 Jan 1904 | Wolverhampton Wanderers v Derby County | D | 2-2 | League Division One | |
| 09 Jan 1904 | Derby County v Manchester City | L | 2-3 | League Division One | |
| 16 Jan 1904 | Notts County v Derby County | D | 2-2 | League Division One | |
| 23 Jan 1904 | Derby County v Sheffield United | L | 3-5 | League Division One | |
| 30 Jan 1904 | Newcastle United v Derby County | D | 0-0 | League Division One | |
| 06 Feb 1904 | Portsmouth v Derby County | W | 2-5 | FA Cup | 1st round |
| 13 Feb 1904 | Middlesbrough v Derby County | D | 0-0 | League Division One | |
| 20 Feb 1904 | Derby County v Wolverhampton Wanderers | D | 2-2 | FA Cup | 2nd round |
| 24 Feb 1904 | Wolverhampton Wanderers v Derby County | D | 2-2 | FA Cup | 2nd round replay |
| 27 Feb 1904 | Bury v Derby County | D | 2-2 | League Division One | |
| 29 Feb 1904 | Derby County v Wolverhampton Wanderers | W | 1-0 | FA Cup | 2nd round 2nd replay |
| 05 Mar 1904 | Derby County v Blackburn Rovers | W | 2-1 | FA Cup | Quarter-final |
| 19 Mar 1904 | Bolton Wanderers v Derby County | L | 1-0 | FA Cup | Semi-final |
| 26 Mar 1904 | Sunderland v Derby County | W | 0-3 | League Division One | |
| 02 Apr 1904 | Derby County v West Bromwich Albion | W | 4-2 | League Division One | |
| 09 Apr 1904 | Small Heath v Derby County | L | 1-0 | League Division One | |
| 11 Apr 1904 | Derby County v Blackburn Rovers | W | 3-0 | League Division One | |
| 16 Apr 1904 | Derby County v Everton | L | 0-1 | League Division One | |
| 23 Apr 1904 | Stoke v Derby County | D | 1-1 | League Division One | |
| 17 Dec 1904 | Manchester City v Derby County | L | 6-0 | League Division One | |
| 24 Dec 1904 | Derby County v Notts County | D | 1-1 | League Division One | |
Please note: Match history is complete for the Premier and Football Leagues and (in most cases all) internationals.