Mac Williamson

Mac Williamson

34-Year-Old OutfielderOF
 Free Agent  
2025 Fantasy Outlook
There was no outlook written for Mac Williamson in 2025. Check out the latest news below for more on his current fantasy value.
$Signed a minor-league contract with the Nationals in January of 2020. Released by the Nationals in June of 2020.
Suing former team
OFFree Agent  
November 10, 2020
Williamson is suing the Giants over the concussion he suffered back in 2018, which he says, "ended [his] career," Henry Schulman of the San Francisco Chronicle reports.
ANALYSIS
Williamson alleges the Giants created a dangerous work environment by having bullpen mounds on the field, a setup which caused him to trip and hit his head on a wall. He still has symptoms such as blurred vision. The fact that Williamson considers his career to be over is significant, as he hadn't officially announced his retirement. Williamson is a 30-year-old with a .203/.282/.348 career slash line in 160 big-league games.
Read More News
Batting Stats
Loading Batting Stats...
2019
2018
2017
2019 MLB Game Log
calculator icon
Calculate Stats Over Time
Just click on any two dates.
Scoring
FanDuel
DraftKings
Yahoo DFS
Sorare
Loading Batting Game Log...
2018 MLB Game Log
calculator icon
Calculate Stats Over Time
Just click on any two dates.
Scoring
FanDuel
DraftKings
Yahoo DFS
Sorare
Loading Batting Game Log...
2017 MLB Game Log
calculator icon
Calculate Stats Over Time
Just click on any two dates.
Scoring
FanDuel
DraftKings
Yahoo DFS
Sorare
Loading Batting Game Log...
Minor League Game Log
calculator icon
Calculate Stats Over Time
Just click on any two dates.
Loading Minor League Batting Game Log...
Advanced Batting Stats
Loading Advanced Batting Stats...
Additional Stats
Games By Position
Defensive Stats
Loading Games Played by Position...
Loading MLB Defensive Stats...
Batted Ball Stats
Loading Batted Ball Stats...
Stats Vs Upcoming Pitchers
Want more matchup stats?
Loading Matchup Stats...
Recent RotoWire Articles Featuring Mac Williamson See More
The Z Files: Winning Tendencies, Part Four
May 16, 2020
Todd Zola continues his breakdown of last year's NFBC Main Event rosters and explains why he thinks Christian Yelich showed up on so few league-winning squads.
Games Played By Position: 2020 Eligibility Notes
October 16, 2019
Clay Link looks at appearances by position and makes note of multi-position eligibility and lost eligibility for 2020.
The Z Files: It's Better To Be Lucky and Good
October 4, 2019
Todd Zola looks back on his TGFBI-winning roster and notes there was more than luck involved in him drafting breakout players like Cody Bellinger.
AL FAAB Factor: Waiver Pickups of the Week
July 7, 2019
Erik Siegrist looks over the AL free-agent pool heading into the All-Star break and thinks Blue Jays catcher Danny Jansen is poised to flip the script on a disappointing season.
AL FAAB Factor: Waiver Pickups of the Week
June 30, 2019
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.
Past Fantasy Outlooks
2020
2019
2018
2017
2016
2015
Williamson has found success at the minor-league level, but he simply was not able to make enough contact against big-league arms, which led to him signing a contract to play in Korea last July. The 29-year-old recorded a 1.119 OPS over 26 games at the Triple-A level in 2019, but had a meager .156/.250/.258 slash line over 40 games with the Mariners and Giants, poor numbers fueled by a 30.6 K%. Williamson has not hit for enough power to compensate, as he only had five extra-base hits in 2019 and has managed just a .145 ISO in 483 career plate appearances. So far there has been nothing to suggest he will return stateside to affiliated baseball in 2020. Even if he somehow makes it back to the majors, he would need to prove that he can make more consistent contact against major-league pitchers before becoming worthy of fantasy consideration.
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.
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
Let go by Washington
OFFree Agent  
June 1, 2020
The Nationals released Williamson on Monday, Brittany Ghiroli of The Athletic reports.
ANALYSIS
Subscribe now to instantly reveal our take on this news.
Returns stateside with Nationals
OFWashington Nationals  
January 15, 2020
Williamson signed with the Nationals as a non-roster invitee Wednesday, Bob Nightengale of USA Today reports.
ANALYSIS
Subscribe now to instantly reveal our take on this news.
Headed to KBO
OFFree Agent  
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
Subscribe now to instantly reveal our take on this news.
Outrighted to Triple-A
OFSeattle Mariners  
July 17, 2019
Williamson was sent outright to Triple-A Tacoma on Wednesday, Greg Johns of MLB.com reports.
ANALYSIS
Subscribe now to instantly reveal our take on this news.
DFA'd by Seattle
OFSeattle Mariners  
July 16, 2019
Williamson was designated for assignment by the Mariners on Tuesday.
ANALYSIS
Subscribe now to instantly reveal our take on this news.