Third baseman John Kennedy played 12 seasons for 5 teams. He had a .225 batting average with 475 hits, 32 home runs, 185 runs batted in, and 237 runs scored.
| Season | TM | LG | G | AB | R | H | 2B | 3B | HR | RBI | BB | HBP | SO | SB | CS | AVG | OBP | SLG |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 1962 | WSH | AL | 14 | 42 | 6 | 11 | 0 | 1 | 1 | 2 | 2 | 0 | 7 | 0 | 1 | .262 | .295 | .381 |
| 1963 | WSH | AL | 36 | 62 | 3 | 11 | 1 | 1 | 0 | 4 | 6 | 1 | 22 | 2 | 0 | .177 | .261 | .226 |
| 1964 | WSH | AL | 148 | 482 | 55 | 111 | 16 | 4 | 7 | 35 | 29 | 5 | 119 | 3 | 3 | .230 | .280 | .324 |
| 1965 | LAD | NL | 104 | 105 | 12 | 18 | 3 | 0 | 1 | 5 | 8 | 2 | 33 | 1 | 0 | .171 | .243 | .229 |
| 1966 | LAD | NL | 125 | 274 | 15 | 55 | 9 | 2 | 3 | 24 | 10 | 5 | 64 | 1 | 2 | .201 | .241 | .281 |
| 1967 | NYY | AL | 78 | 179 | 22 | 35 | 4 | 0 | 1 | 17 | 17 | 1 | 35 | 2 | 1 | .196 | .265 | .235 |
| 1969 | SEA | AL | 61 | 128 | 18 | 30 | 3 | 1 | 4 | 14 | 14 | 1 | 25 | 4 | 0 | .234 | .315 | .367 |
| 1970 | BOS | AL | 43 | 129 | 15 | 33 | 7 | 1 | 4 | 17 | 6 | 1 | 14 | 0 | 0 | .256 | .292 | .419 |
| 1970 | MIL | AL | 25 | 55 | 8 | 14 | 2 | 0 | 2 | 6 | 5 | 0 | 9 | 0 | 1 | .255 | .317 | .400 |
| 1970 | TOT | AL | 68 | 184 | 23 | 47 | 9 | 1 | 6 | 23 | 11 | 1 | 23 | 0 | 1 | .255 | .299 | .413 |
| 1971 | BOS | AL | 74 | 272 | 41 | 75 | 12 | 5 | 5 | 22 | 14 | 4 | 42 | 1 | 1 | .276 | .320 | .412 |
| 1972 | BOS | AL | 71 | 212 | 22 | 52 | 11 | 1 | 2 | 22 | 18 | 3 | 40 | 0 | 1 | .245 | .311 | .335 |
| 1973 | BOS | AL | 67 | 155 | 17 | 28 | 9 | 1 | 1 | 16 | 12 | 2 | 45 | 0 | 0 | .181 | .246 | .271 |
| 1974 | BOS | AL | 10 | 15 | 3 | 2 | 0 | 0 | 1 | 1 | 1 | 0 | 6 | 0 | 0 | .133 | .188 | .333 |
| Career | 856 | 2,110 | 237 | 475 | 77 | 17 | 32 | 185 | 142 | 25 | 461 | 14 | 10 | .225 | .281 | .323 |