Bryce Harper has the best OPS by a 19-year-old player with 503+ plate appearances in a season, with an OPS of .817 in his rookie season in 2012.
| NAME | OPS | Age | PA | SEASON | TM | G | AB | R | H | 2B | 3B | HR | RBI | BB | HBP | SO | SB | CS | TB | XBH | SH | SF | IBB | GIDP | AVG | OBP | SLG | wRC | WRAA | wOBA | wRC+ | BRAA | ||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 1 |  | B. Harper | .817 | 19 | 597 | 2012 |  WSH | 139 | 533 | 98 | 144 | 26 | 9 | 22 | 59 | 56 | 2 | 120 | 18 | 6 | 254 | 57 | 3 | 3 | 0 | 8 | .270 | .340 | .477 | 86 | 17.9 | .352 | 121 | 14.9 |
| 2 |  | K. Griffey Jr. | .748 | 19 | 506 | 1989 |  SEA | 127 | 455 | 61 | 120 | 23 | 0 | 16 | 61 | 44 | 2 | 83 | 16 | 7 | 191 | 39 | 1 | 4 | 8 | 4 | .264 | .329 | .420 | 62 | 7.4 | .333 | 105 | 3 |
| 3 |  | B. Lewis | .746 | 19 | 657 | 1936 |  WSH | 143 | 601 | 100 | 175 | 21 | 13 | 6 | 67 | 47 | 4 | 46 | 6 | 6 | 240 | 40 | 5 | .291 | .347 | .399 | 84 | -2 | .346 | 86 | -13.6 | |||
| 4 | | G. Davis | .711 | 19 | 583 | 1890 | CLN | 136 | 526 | 98 | 139 | 22 | 9 | 6 | 73 | 53 | 4 | 34 | 22 | 197 | 37 | .264 | .336 | .375 | 93 | 3.3 | .344 | 104 | 3.8 | |||||
| 5 | | R. Yount | .674 | 19 | 607 | 1975 |  MIL | 147 | 558 | 67 | 149 | 28 | 2 | 8 | 52 | 33 | 1 | 69 | 12 | 4 | 205 | 38 | 10 | 5 | 3 | 8 | .267 | .307 | .367 | 60 | -6.4 | .307 | 90 | -7 |
| 6 | | S. Sisti | .664 | 19 | 507 | 1940 |  BSN | 123 | 459 | 73 | 115 | 19 | 5 | 6 | 34 | 36 | 4 | 64 | 4 | 162 | 30 | 8 | 4 | .251 | .311 | .353 | 50 | -10.8 | .307 | 88 | -7.4 | |||
| 7 | | A. Kaline | .652 | 19 | 535 | 1954 |  DET | 138 | 504 | 43 | 139 | 18 | 3 | 4 | 43 | 22 | 0 | 45 | 9 | 5 | 175 | 25 | 7 | 2 | 21 | .276 | .305 | .347 | 47 | -13.8 | .300 | 76 | -14.6 | |
| 8 | | R. Staub | .617 | 19 | 585 | 1963 |  HOU | 150 | 513 | 43 | 115 | 17 | 4 | 6 | 45 | 59 | 5 | 58 | 0 | 0 | 158 | 27 | 6 | 2 | 8 | 10 | .224 | .309 | .308 | 50 | -10.7 | .279 | 84 | -10.2 |
| 9 | | B. Kennedy | .616 | 19 | 655 | 1940 |  CWS | 154 | 606 | 74 | 153 | 23 | 3 | 3 | 52 | 42 | 0 | 58 | 3 | 7 | 191 | 29 | 7 | 17 | .252 | .301 | .315 | 55 | -24.2 | .288 | 62 | -34.3 | ||
| 10 | | W. Smalley | .542 | 19 | 567 | 1890 | CLN | 136 | 502 | 62 | 107 | 11 | 1 | 0 | 42 | 60 | 5 | 44 | 10 | 120 | 12 | .213 | .303 | .239 | 61 | -25.8 | .282 | 71 | -25.3 |
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