Mac Williamson
Mac Williamson
29-Year-Old OutfielderOF
 Free Agent  Foreign
Free Agent
2019 Fantasy Outlook
Williamson was a sleeper last spring after working with noted swing doctor Doug Latta in the offseason. The tutelage paid off as Williamson was summoned after just 11 games after slashing .487/.600/1.026. He continued mashing, hitting safely in his first five games with the Giants, including bashing three homers. Then disaster struck as he was concussed after crashing into an outfield wall. Williamson was slow to recover, eventually returning in late May. Williamson never got it going again, posting a .571 OPS in 23 games before being demoted to Triple-A in late June. He stayed on the farm the rest of the season and continued to slump, recording a .623 OPS his second stint with the Grizzlies. He was placed on the minor-league DL in mid-August with symptoms related to his April concussion. If Williamson is recovered in the spring, he'll again be a candidate for cheap power. Read Past Outlooks
RANKSFrom Preseason
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$Signed a one-year, minor-league contract with the Mariners in June of 2019. Released by the Mariners in July of 2019.
Headed to KBO
OFFree Agent  F
July 23, 2019
Williamson is nearing an agreement to sign with the Samsung Lions of the Korea Baseball Organization, Sung Min Kim of The Athletic reports.
ANALYSIS
WIlliamson's rights remain with the Mariners after he recently accepted an outright assignment to Triple-A Tacoma, but he'll likely be released from his obligations to the organization while he pursues what's presumably a more lucrative opportunity overseas. The 29-year-old Williamson has posted some eye-popping numbers in the Triple-A ranks over the past three seasons, but his 28.8 percent career strikeout rate has prevented him from finding much sustained success in the majors. He could emerge as one of the KBO's top power hitters while having the luxury of teeing off against pitchers who typically work at lower velocities than their MLB counterparts.
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Batting Stats
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Batting Order Slot Breakdown
vs Right-Handed Pitchers
vs RHP
#1
#2
#3
#4
#5
#6
#7
#8
#9
4
1
4
11
3
vs Left-Handed Pitchers
vs LHP
#1
#2
#3
#4
#5
#6
#7
#8
#9
1
6
4
1
Left/Right Batting Splits
Since 2017
 
 
+9%
OPS vs LHP
2019
 
 
+76%
OPS vs RHP
2018
 
 
+38%
OPS vs LHP
2017
 
 
+42%
OPS vs LHP
OPS PA R HR RBI SB AVG OBP SLG
Since 2017vs Left .643 81 7 2 7 0 .240 .296 .347
Since 2017vs Right .591 241 28 9 27 4 .177 .266 .326
2019vs Left .321 32 0 0 2 0 .133 .188 .133
2019vs Right .564 112 13 4 15 2 .163 .268 .296
2018vs Left .839 32 5 1 4 0 .286 .375 .464
2018vs Right .609 73 9 3 7 1 .182 .260 .348
2017vs Left .882 17 2 1 1 0 .353 .353 .529
2017vs Right .621 56 6 2 5 1 .196 .268 .353
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Home/Away Batting Splits
Since 2017
 
 
+4%
OPS on Road
2019
 
 
+19%
OPS at Home
2018
 
 
+1%
OPS at Home
2017
 
 
+34%
OPS on Road
OPS PA R HR RBI SB AVG OBP SLG
Since 2017Home .592 139 16 5 17 2 .183 .259 .333
Since 2017Away .613 183 19 6 17 2 .201 .284 .329
2019Home .552 71 7 3 10 2 .156 .239 .313
2019Away .463 73 6 1 7 0 .156 .260 .203
2018Home .682 41 7 2 6 0 .194 .293 .389
2018Away .676 64 7 2 5 1 .224 .297 .379
2017Home .567 27 2 0 1 0 .231 .259 .308
2017Away .757 46 6 3 5 1 .238 .304 .452
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Stat Review
How does Mac Williamson compare to other hitters?
This section compares his stats with all batting seasons from the previous three seasons (minimum 400 plate appearances)*. The bar represents the player's percentile rank. For example, if the bar is halfway across, then the player falls into the 50th percentile for that stat and it would be considered average.

* Exit Velocity and Barrels/PA % are benchmarked against 2019 data (min 400 PA) and Hard Hit Rate is benchmarked against last season's data (min 400 PA). See here for more exit velocity/barrels stats plus an explanation of current limitations with that data set.
  • BB/K
    Walk to strikeout ratio
  • BB Rate
    The percentage of plate appearances resulting in a walk.
  • K Rate
    The percentage of plate appearances resulting in a strikeout.
  • BABIP
    Batting average on balls in play. Measures how many of a batter’s balls in play go for hits.
  • ISO
    Isolated Power. Slugging percentage minus batting average. A computation used to measure a batter's raw power.
  • AVG
    Batting average. Hits divided by at bats.
  • OBP
    On Base Percentage. A measure of how often a batters reaches base. Roughly equal to number of times on base divided by plate appearances.
  • SLG
    Slugging Percentage. A measure of the batting productivity of a hitter. It is calculated as total bases divided by at bats.
  • OPS
    On base plus slugging. THe sum of a batter's on-base percentage and slugging percentage.
  • wOBA
    Weighted on-base average. Measures a player's overall offensive contributions per plate appearance. wOBA combines all the different aspects of hitting into one metric, weighting each of them in proportion to their actual run value.
  • Exit Velocity
    The speed of the baseball as it comes off the bat, immediately after a batter makes contact.
  • Hard Hit Rate
    A measure of contact quality from Sports Info Solutions. This stat explains what percentage of batted balls were hit hard vs. medium or soft.
  • Barrels/PA
    The percentage of plate appearances where a batter had a batted ball classified as a Barrel. A Barrel is a batted ball with similar exit velocity and launch angle to past ones that led to a minimum .500 batting average and 1.500 slugging percentage.
BB/K
0.32
 
BB Rate
9.7%
 
K Rate
30.6%
 
BABIP
.200
 
ISO
.102
 
AVG
.156
 
OBP
.250
 
SLG
.258
 
OPS
.508
 
wOBA
.237
 
Exit Velocity
85.3 mph
 
Hard Hit Rate
31.0%
 
Barrels/PA
2.1%
 
Advanced Batting Stats
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Additional Stats
Games By Position
Defensive Stats
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Stats Vs Upcoming Pitchers
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Recent RotoWire Articles Featuring Mac Williamson
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11 days ago
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100 days ago
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107 days ago
Erik Siegrist looks over the free-agent pool in the American League and thinks Brendan McKay is ready to make a big impact in the Tampa Bay rotation.
AL FAAB Factor: Waiver Pickups of the Week
128 days ago
Erik Siegrist looks over the American League free-agent pool and expects bidding to be fierce for Yordan Alvarez as he makes his much-anticipated Astros debut.
NL FAAB Factor: Waiver Pickups of the Week
142 days ago
In this week's installment, Jan Levine believes Matt Adams should be able to produce while Ryan Zimmerman is out.
Past Fantasy Outlooks
2018
2017
2016
2015
Just as he did in 2016, Williamson split time between Triple-A and the majors throughout the 2017 campaign. The 27-year-old also wound up producing relatively similar results compared with the previous two seasons. His power is his biggest calling card, as he blasted 14 homers in the minors and three in the majors, all while driving in 56 runs between the two levels. He continues to struggle to make contact, however, as his 34.2 percent strikeout rate suggests. His saving grace in 2016 was a high walk rate, but Williamson even regressed in that category. Granted, he did produce an .870 OPS in 16 games following a September callup, but the same flaws continue to haunt him year after year. He could work his way into a starting role with a strong spring training barring the addition of adequate upgrades to the depth chart, but it will be hard for Williamson to maintain a prominent role in the Giants' lineup if he fails to adjust to big-league pitching.
Williamson started the year in the minors, slashing .269/.314/.495 in 54 games with Triple-A Sacramento. He was promoted to the majors a few times throughout the season, but he received the majority of his playing time in right field after Hunter Pence landed on the disabled list in June. Over that period of time, Williamson proved to be the type of player many had him pegged as; a powerful hitter who strikes out a lot. A 10.8 percent walk rate helped offset his high strikeout rate (27.6 percent), and his .188 isolated power rating was above the league average. He undoubtedly has the ability to hit 25-plus homers over the course of a full season, but he will need to cut down on his whiffs if he wants to get an everyday role in the majors, especially for a Giants team that has a station-to-station offensive approach. Even though there may be an opening in left field if the team doesn't bring Angel Pagan back, Williamson will likely serve as a fourth or fifth outfielder to begin the 2017 campaign.
Williamson returned from successful Tommy John surgery in 2015 - yes, hitters too can tear their UCLs -and he performed well at Double-A Richmond and Triple-A Sacramento before getting his first taste of major league action in September. He didn't fare well with the big club, slashing .219/.235/.281 in 34 plate appearances. While the results were poor for the 25-year-old outfielder, it wasn't that long ago when he had a 25-homer, 10-steal season with High-A San Jose, so there is hope that he can restore his status as one of the Giants' top offensive prospects. He will almost assuredly start the year in the minors, and a fast start could earn him a call up later in the season.
Last season was supposed to be Williamson’s chance to prove that his power explosion at High-A San Jose in 2013 was sustainable against better pitching. Instead he missed most of the season after needing Tommy John surgery in late April. Unlike Miguel Sano, whose pedigree kept him near the top of prospect rankings despite missing 2014 after tearing his UCL, Williamson will not necessarily be given the benefit of the doubt in the prospect community. The 24-year-old right fielder was selected out of college in the third round of the 2012 draft and turned heads in his first full season, slashing .292/.375/.504 with 25 home runs and 10 steals in 597 plate appearances in 2013. It is not clear exactly when he will be ready to return to game action in 2015, but if he finishes the year healthy and at Double-A, that would have to be considered a success.
More Fantasy News
Outrighted to Triple-A
OFSeattle Mariners  F
July 17, 2019
Williamson was sent outright to Triple-A Tacoma on Wednesday, Greg Johns of MLB.com reports.
ANALYSIS
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DFA'd by Seattle
OFSeattle Mariners  F
July 16, 2019
Williamson was designated for assignment by the Mariners on Tuesday.
ANALYSIS
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Playing time slips
OFSeattle Mariners  F
June 30, 2019
Williamson is out of the lineup for Sunday's game against the Astros, Greg Johns of MLB.com reports.
ANALYSIS
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Another productive start
OFSeattle Mariners  F
June 24, 2019
Williamson went 1-for-3 with an RBI double play, a two-run home run and three runs overall in a win over the Orioles on Sunday.
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Swats solo homer
OFSeattle Mariners  F
June 21, 2019
Williamson went 1-for-5 with a solo home run in Friday's 10-9 win over the Orioles.
ANALYSIS
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