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Seattle Mariners outfielder Victor Robles has learned his fate after hurling a bat at a pitcher in retaliation for getting hit by a pitch during a minor league rehab assignment on Sunday ... with Major League Baseball handing him a 10-game ban.

The league revealed the news Tuesday ... saying along with his suspension, he has been tagged with an undisclosed fine. The kicker for Robles is that the clock doesn't start until he is back on the Major League Active Roster. In other words -- the moment he returns to Seattle, the suspension officially takes effect.

Robles has elected to appeal the ruling, and he will be eligible to play until that process concludes.

In case you missed it, the incident went down when the Tacoma Rainiers were wrapping up a six-game set against the Las Veg

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