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 |
Mac Williamson: the record in brief
Mac Williamson played a first major league game on September 23, 2015 and a last one on July 14, 2019. Club by club, the record runs the San Francisco Giants (2015 to 2019) and the Seattle Mariners (2019). Williamson played primarily as an outfielder and both batted and threw right-handed. Born on July 15, 1990, in Jacksonville, FL, USA, Williamson was listed at 6'4" and 237 pounds. Mac Williamson was the playing name; the full given name is Johnathan Mackensey.
Williamson's career batting table shows 160 games, 434 at bats and 88 hits, a .203 average; the totals also include 17 homers and 50 RBI. Reaching base at a .282 clip and slugging .348, Williamson finished with a .629 OPS. Williamson's .203 average ran 19.9% below the .253 that the league posted over the same seasons. The OPS comparison is .629 to a league .739, 14.8% below average. 2016 produced Williamson's most hits, 25 of them for the San Francisco Giants. Even the best average among the busiest seasons, .235 in 2017, did not top the league's .254.
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 teams did Mac Williamson play for?
- Mac Williamson played for 2 teams: the San Francisco Giants (2015–2019) and the Seattle Mariners (2019).
- What were Mac Williamson's career stats?
- In 160 games, Mac Williamson had 88 hits, 17 home runs, 50 RBI, 51 runs, and 4 stolen bases, with a .203 batting average.
- What position did Mac Williamson play?
- Mac Williamson played primarily as an outfielder, the position where he appeared in the most games.
- How tall was Mac Williamson and how much did he weigh?
- Mac Williamson was listed at 6 feet 4 inches and 237 pounds.
- How many home runs did Mac Williamson hit each season?
- Mac Williamson's home runs by season: 0 in 2015, 6 in 2016, 3 in 2017, 4 in 2018, and 4 in 2019. His most in one season was 6, in 2016.
- 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.