He played eight seasons in MLB for the Chicago Cubs, Tampa Bay Rays, Oakland Athletics, and Minnesota Twins.

In the minor leagues—as a result of his defensive play—he was referred to as "a crash test dummy with a death wish", a "human wrecking ball act", a "wall magnet", and a "manager's dream and a trainer's worst nightmare".

Fuld made the Rays' 2011 opening day roster, and won the jobs of starting left fielder and leadoff hitter by mid-April.

[17][2][22] He was a two-time All-American and a four-year starter in center field for the Cardinal, playing alongside future major leaguers Carlos Quentin and Jed Lowrie.

He was also named a Jewish Sports Review College Baseball First Team All-American, along with future major leaguers Craig Breslow and Adam Greenberg.

He batted .421 with two homers in four CWS games, earning a spot on the All-College World Series Team for the second straight year.

Reflecting on his college career, Fuld said: "I think one of the things you take away from playing under Coach Marquess is whatever you do, be it baseball or anything else, you do it well and you do it with passion.

"There's so many statistics out there that I thought 'There's no stats on foul balls,' so I picked a few players and started tracking them, thinking I'd find something", Fuld said.

[49] "He knows how to play the game, when to take a pitch, when to work the count, and when to go ahead and swing away and juice the ball", said his Tennessee manager, Pat Listach.

There, due to his style of defensive play, he was referred to as "a crash test dummy with a death wish", a "human wrecking ball act", a "wall magnet", and a "manager's dream and a trainer's worst nightmare.

"[62] Fuld began the 2008 season at Triple-A Iowa, but was demoted to the Double-A Tennessee Smokies in May after struggling at the plate due to a right thumb injury.

He hit leadoff for Aragua, while batting .322 with 5 triples (leading the league), 36 walks and 43 runs (2nd), 16 doubles (5th), a .425 on-base percentage (7th), and a .938 OPS (8th).

[69] Fuld began 2009 at Iowa, and hit .286 with 20 stolen bases and 8 triples in 73 games, including .326 versus left-handed pitchers, primarily playing center field until he was called up on June 30.

[78] Later in the month, he was hazed after a game—made to walk from the park in Cincinnati to the team's downtown hotel in a Batgirl getup, accompanied by Félix Pie in pink baby pajamas, Carmen Pignatiello (as Supergirl), and Kevin Hart (as Wonder Woman).

[96][97] Fuld played for the Cubs in spring training in 2009, but was sent down to their AAA team in late March to work on stealing bases.

[104] Fuld hit the first home run of his major league career in the final game of the Cubs' 2009 season, on October 4 at Wrigley Field.

[106][110] Baseball writer Rob Neyer, noting that this followed Fuld batting .299 with a .409 on-base percentage for the Cubs, wrote, "don't you think you could find a place for a fast guy who gets on base and plays great defense?

But those who don't believe guys of Fuld's size can be solid major league players should be sentenced to sit in the corner under the dunce hat, and read Joe Morgan's statistics over and over.

[16][113][114][115] He was traded with minor leaguers Hak-Ju Lee, Brandon Guyer, Robinson Chirinos, and Chris Archer for starting pitcher Matt Garza, outfielder Fernando Perez, and reliever Zac Rosscup.

"[106] Fuld made the team's Opening Day roster, his first in the majors, as its fourth outfielder, and a late-inning weapon off the bench, speedster pinch runner, and defensive replacement.

[104] However, with Manny Ramirez sudden retirement, left fielder Johnny Damon became the team's DH, expanding Fuld's role.

On April 7, he stole a career-high 3 bases in one game, and Maddon began penciling him into the lineup as the team's everyday leadoff hitter.

[123][124][125][126] On April 9, playing right field against the Chicago White Sox who had the bases loaded, Fuld made what the Tampa Tribune called "one of the best catches in team history".

"[127][129] His popularity spread on the internet by late April, with the Toronto Sun writing: "Fuld ranks in the Top 10 in batting average, runs, and triples, and also leads the AL in stolen bases and YouTube hits, especially video hits for a catch in Chicago diving towards the right field corner onto the warning track that has been set to a Superman theme.

[170] In 2016, Fuld suffered a left shoulder rotator cuff injury that necessitated surgery, after he batted .417 in spring training for the A's.

"[175] After the 2018 season the Toronto Blue Jays interviewed Fuld to be their next manager, and he reportedly “made a strong impression”, but withdrew his name from consideration.

[177] At the same time, Gerry Fraley, writer for The Dallas Morning News, opined that Fuld was an interesting possibility to be hired as the next Texas Rangers manager.

[178] After the 2019 regular season, Fuld's name was mentioned by a number of people as a candidate for the position of manager with the Pittsburgh Pirates.

Fuld is currently pursuing a Master of Business Administration (MBA) degree at the University of Pennsylvania's Wharton School, and will assume the new role upon his graduation in 2026.

He recalled, "I was losing weight, I was thirsty all the time, just classic symptoms, so my parents knew something was wrong and the doctor diagnosed it right away.