| Full name: | John Francis Martin O'Brien |
| Born: | 25th May 1961, Birkenhead, Cheshire, England |
| Batting: | Right-hand batter |
| Bowling: | Slow left-arm orthodox |
| Teams: | Cheshire (Main ListA: 1987-1995); Cheshire (Minor Counties Championship: 1986-1995); Cheshire (Minor Counties Trophy: 1987-1995); All teams |
| Cheshire cap: 1988 | |
| Lists of matches and more detailed statistics | |
| List A Career Batting and Fielding (1987-1995) | ||||||||||
| M | I | NO | Runs | HS | Ave | 100 | 50 | Ct | ||
| Cheshire | 8 | 8 | 6 | 61 | 14* | 30.50 | 0 | 0 | 5 | |
| List A Career Bowling (1987-1995) | ||||||||||
| Balls | Mdns | Runs | Wkts | BB | Ave | 4wI | 5wI | SRate | Econ | |
| Cheshire | 432 | 9 | 290 | 11 | 4-40 | 26.36 | 1 | 0 | 39.27 | 4.02 |
| Minor Counties Championship Career Batting and Fielding (1986-1995) | ||||||||||
| M | I | NO | Runs | HS | Ave | 100 | 50 | Ct | ||
| Cheshire | 71 | 52 | 21 | 367 | 50* | 11.83 | 0 | 1 | 26 | |
| Minor Counties Championship Career Bowling (1986-1995) | ||||||||||
| Balls | Mdns | Runs | Wkts | BB | Ave | 5wI | 10wM | SRate | Econ | |
| Cheshire | 11425 | 448 | 5857 | 241 | 5-32 | 24.30 | 8 | 0 | 47.40 | 3.07 |
| Minor Counties Trophy Career Batting and Fielding (1987-1995) | ||||||||||
| M | I | NO | Runs | HS | Ave | 100 | 50 | Ct | ||
| Cheshire | 18 | 7 | 4 | 20 | 9* | 6.66 | 0 | 0 | 6 | |
| Minor Counties Trophy Career Bowling (1987-1995) | ||||||||||
| Balls | Mdns | Runs | Wkts | BB | Ave | 4wI | 5wI | SRate | Econ | |
| Cheshire | 1077 | 27 | 600 | 31 | 5-18 | 19.35 | 1 | 2 | 34.74 | 3.34 |