Mac Williamson
Outfielder · Career Stats, Bio & Records (2015-2019)
Mac Williamson was an outfielder who played in Major League Baseball from 2015 to 2019 for the San Francisco Giants and the Seattle Mariners, a span of 5 seasons. In 160 career games, he hit .203 with 88 hits, 17 home runs, and 50 RBI.
- AVG (Batting Average):
- Hits divided by at bats. .300 is the traditional mark of an excellent hitter.
- HR (Home Runs):
- Hits on which the batter circled the bases and scored, almost always by clearing the outfield fence.
- RBI (Runs Batted In):
- Runs that scored as a direct result of a batter's plate appearance.
- OPS (On-Base Plus Slugging):
- On-base percentage plus slugging percentage, the quickest single summary of offensive value. .900 or better is star-level.
Data updated
- Position
- Outfielder
- Bats / Throws
- R / R
- Height / Weight
- 6'4" / 237 lb
- MLB Debut
- 2015-09-23
- Last Game
- 2019-07-14
Full name: Johnathan Mackensey Williamson
Career Batting Statistics
| G | AB | R | H | 2B | 3B | HR | RBI | SB | BB | SO | AVG | OBP | SLG | OPS | PIV |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 160 | 434 | 51 | 88 | 10 | 1 | 17 | 50 | 4 | 43 | 139 | .203 | .282 | .348 | .629 | -885 |
Career AVG .203 vs. league average .253 across their career seasons — 19.9% below league average.
Career OBP .282 vs. league average .321 across their career seasons — 12.2% below league average.
Career SLG .348 vs. league average .418 across their career seasons — 16.9% below league average.
Career OPS .629 vs. league average .739 across their career seasons — 14.8% below league average.
Season-by-Season Batting
Click a stat to plot it across every season.
| Year | Team | Lg | G | AB | R | H | 2B | 3B | HR | RBI | SB | BB | SO | AVG | Lg AVG | Lg OBP | Lg SLG | Lg OPS | PIV |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 2015 | SFN | NL | 10 | 32 | 2 | 7 | 0 | 1 | 0 | 1 | 0 | 0 | 8 | .219 | — | — | — | — | 0.0 |
| 2016 | SFN | NL | 54 | 112 | 14 | 25 | 3 | 0 | 6 | 15 | 0 | 13 | 35 | .223 | .255 (-13%) | .321 (-2%) | .417 (-2%) | .738 (-2%) | -10.5 |
| 2017 | SFN | NL | 28 | 68 | 8 | 16 | 2 | 0 | 3 | 6 | 1 | 5 | 25 | .235 | .254 (-8%) | .324 (-11%) | .425 (-7%) | .750 (-9%) | -100.2 |
| 2018 | SFN | NL | 28 | 94 | 14 | 20 | 4 | 0 | 4 | 11 | 1 | 11 | 27 | .213 | .247 (-14%) | .318 (-7%) | .409 (-6%) | .727 (-7%) | -96.8 |
| 2019 | SFN | NL | 15 | 51 | 3 | 6 | 1 | 0 | 1 | 7 | 2 | 5 | 18 | .118 | .252 (-53%) | .322 (-35%) | .434 (-55%) | .757 (-46%) | -387.7 |
| 2019 | SEA | AL | 25 | 77 | 10 | 14 | 0 | 0 | 3 | 10 | 0 | 9 | 26 | .182 | .252 (-28%) | .322 (-15%) | .434 (-31%) | .757 (-24%) | -387.7 |
| Career · 6 seasons | 160 | 434 | 51 | 88 | 10 | 1 | 17 | 50 | 4 | 43 | 139 | .203 | — | — | — | — | -983 | ||
Lg columns show the league average for that season, with the player's figure as a percentage above or below it. Career totals the seasons listed above.
Game Log & Splits
View full game log (160 games) →Per-game data from Retrosheet (regular season, through 2025).
Batting — Home / Away
| Split | G | AB | R | H | HR | RBI | AVG |
|---|---|---|---|---|---|---|---|
| Home | 75 | 205 | 22 | 33 | 6 | 20 | .161 |
| Away | 85 | 229 | 29 | 55 | 11 | 30 | .240 |
Last 10 Games — Batting
| Date | Tm | Opp | Res | AB | R | H | 2B | 3B | HR | RBI | BB | SO |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 2019-07-14 | SEA | LAA | L | 2 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 2 |
| 2019-07-13 | SEA | LAA | L | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 |
| 2019-07-12 | SEA | LAA | L | 3 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 |
| 2019-07-05 | SEA | OAK | L | 2 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 1 |
| 2019-07-02 | SEA | STL | W | 3 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 3 |
| 2019-06-29 | SEA | HOU | L | 2 | 0 | 0 | 0 | 0 | 0 | 0 | 1 | 0 |
| 2019-06-28 | SEA | HOU | L | 3 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 1 |
| 2019-06-26 | SEA | MIL | W | 3 | 0 | 1 | 0 | 0 | 0 | 0 | 1 | 2 |
| 2019-06-25 | SEA | MIL | W | 3 | 1 | 1 | 0 | 0 | 0 | 0 | 2 | 0 |
| 2019-06-23 | SEA | BAL | W | 4 | 3 | 1 | 0 | 0 | 1 | 3 | 0 | 0 |
Fielding Statistics
Career Fielding Totals by Position
Season-by-Season Fielding
Career Games by Position
Circle size = games played at each position.
| Position | Games |
|---|---|
| Left Field | 89 |
| Right Field | 42 |
| Designated Hitter | 5 |
Frequently Asked Questions about Mac Williamson
- What years did Mac Williamson play?
- Mac Williamson played in Major League Baseball from 2015 to 2019.
- Was Mac Williamson a pitcher?
- No. Mac Williamson was a position player (Outfielder).
- How many home runs did Mac Williamson hit?
- Mac Williamson hit 17 career home runs with 88 hits.
- What was Mac Williamson's career batting average?
- Mac Williamson batted .203 over his career, with 88 hits in 434 at bats.
- How many RBI did Mac Williamson have?
- Mac Williamson drove in 50 runs in his career.
- Is Mac Williamson in the Hall of Fame?
- No. Mac Williamson has not been inducted into the National Baseball Hall of Fame.