Brandon Moss

A's free-agent signing anniversary: Brandon Moss in 2012

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AP

A's free-agent signing anniversary: Brandon Moss in 2012

Exactly seven years ago, the A's signed a 28-year-old named Brandon Moss to a minor-league contract.

Moss hadn't experienced much success in his career, hitting a total of 23 home runs in five MLB seasons. But it all came together his first year in Oakland.

After starting the 2012 season in Triple-A, Moss got called up by the A's and caught fire. He belted 21 home runs and 52 RBI in 84 games, slashing a phenomenal .291/.358/.596.

Moss continued his impressive power-hitting display in 2013, notching a career-high 30 homers and 87 RBI. In 2014, he added another 25 round-trippers and 81 RBI, making his first and only All-Star Game appearance.

The Moss signing has to be considered an incredible success, as Oakland got consistent production for a very low price. Over the course of three seasons in Oakland, the A's paid him a total of just $6.23 million before trading him to Cleveland in December of 2014. Of course, Moss' second stint with the A's did not work out as well and they will still be on the hook for $1 million next season.

[RELATED: Five non-tendered players the A's could target in MLB free agency]

So what can we learn from the initial signing of Moss? First, you never know for sure when a player is going to come into his own. Countless major leaguers have failed to produce early in their careers only to put it all together several years later.

Baseball is a funny game. It's hard to explain why a player can struggle for one team only to have great success with another. Sometimes a change of scenery can make a world of difference. 

As for Moss, his career appears to be over at the age of 35. In 11 big league seasons, he amassed 160 home runs and 473 RBI.

POLL: A's Memorable Moments -- Moss' 19th-inning HR vs Hernandez walk-off bunt

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AP

POLL: A's Memorable Moments -- Moss' 19th-inning HR vs Hernandez walk-off bunt

PROGRAMMING NOTE: NBC Sports California is looking back at the A's 50 Memorable Moments since the franchise relocated to Oakland in 1968. Below are the next two moments you can vote on. Tune into A's Pregame Live tonight at 6:30pm to watch highlights of the two moments. After the A's and White Sox conclude, tune into A's Postgame Live to see which moment will move on to the next round!

1. Brandon Moss 2-run walk-off HR in 19th inning against Angels in 2013 (Four-time winner -- Defeated Marco Scutaro's walk-off homer off Mariano Rivera on Jackie Robinson Day in 2007)

It started out like any other game on a Monday night. Dan Straily threw the first pitch to Peter Bourjos at 7:09 p.m. The game's final pitch would not be hurled for another six hours and 32 minutes.

At 1:41 a.m. Tuesday, Brandon Moss blasted a two-run home run off Barry Enright in the bottom of the 19th inning, ending the longest game in A's history, a 10-8 victory over the Angels. The game featured 16 different pitchers and 597 pitches.

The Angels took a 7-2 lead into the eighth inning, but the A's rallied for four runs in the eighth and one in the ninth to force extra innings. The teams exchanged runs in the 15th inning to make it 8-8. It would stay that way until the bottom of the 19th, when Moss belted his second home run of the game to finally send everyone home.

VS.

2. Ramon Hernandez's walk-off bunt in 12th inning of Game 1 of 2003 ALDS

Nobody in the entire stadium saw it coming. How could they? With two outs and the bases loaded in the bottom of the 12th inning of a 4-4 game, A's catcher Ramon Hernandez laid down a perfect bunt to beat the Red Sox in Game 1 of the 2003 American League Division Series.

“The element of surprise reigns supreme!” longtime A's announcer Bill King exclaimed. The walk-off bunt capped a thrilling comeback victory for Oakland, which tied the game in the bottom of the ninth on a two-out RBI single by Erubiel Durazo.

At 4 hours and 37 minutes, the game became the longest in Oakland's postseason history. The A's would also win Game 2, 5-1, but the Red Sox stormed back with three straight victories to take the series in five games.

VOTE HERE:

POLL: A's Memorable Moments -- Moss' 19th-inning HR vs Scutaro's walk-off HR on Jackie Robinson Day 2007

moss-scutaro-ap.jpg
AP

POLL: A's Memorable Moments -- Moss' 19th-inning HR vs Scutaro's walk-off HR on Jackie Robinson Day 2007

PROGRAMMING NOTE: NBC Sports California is looking back at the A's 50 Memorable Moments since the franchise relocated to Oakland in 1968. Below are the next two moments you can vote on. Tune into A's Pregame Live tonight at 6:30pm to watch highlights of the two moments. After the A's and Mariners conclude, tune into A's Postgame Live to see which moment will move on to the next round!

1. Brandon Moss 2-run walk-off HR in 19th inning against Angels in 2013 (Three-time winner -- Defeated Reggie Jackson's titanic home run during the 1971 All-Star Game in Detroit on Tuesday)

It started out like any other game on a Monday night. Dan Straily threw the first pitch to Peter Bourjos at 7:09 p.m. The game's final pitch would not be hurled for another six hours and 32 minutes.

At 1:41 a.m. Tuesday, Brandon Moss blasted a two-run home run off Barry Enright in the bottom of the 19th inning, ending the longest game in A's history, a 10-8 victory over the Angels. The game featured 16 different pitchers and 597 pitches.

The Angels took a 7-2 lead into the eighth inning, but the A's rallied for four runs in the eighth and one in the ninth to force extra innings. The teams exchanged runs in the 15th inning to make it 8-8. It would stay that way until the bottom of the 19th, when Moss belted his second home run of the game to finally send everyone home.

VS.

2. Marco Scutaro's walk-off homer off Mariano Rivera on Jackie Robinson Day in 2007.

It was the unlikeliest of ninth inning rallies. Down 4-2 with two outs and the bases empty, and facing the greatest closer in Major League Baseball history, the A's were dead in the water. But a Todd Walker single and Jason Kendall walk brought Marco Scutaro to the plate representing the winning run against the Yankees' Mariano Rivera.

Hope began to fade as Scutaro fell behind in the count 0-2. But incredibly, Scutaro belted Rivera's next pitch deep to left field and off the foul pole for a game-winning three-run home run, sending the Coliseum crowd of 35,067 into a frenzy.

The comeback victory took place on Jackie Robinson Day, making it even more memorable. Ironically, Mariano Rivera was the last player to ever wear Robinson's iconic number 42. MLB retired the number and grandfathered it out of usage in 1997.

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