Rondon, 25, struggled last season in Detroit after being promoted to the ninth-inning role. The Tigers ultimately sent him home in September for behavior issues.
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Pitching for Navegantes del Magallanes, Rondon plunked Pirates prospect Jose Osuna of Bravos de Margarita.
The two started a verbal exchange after Rondon threw to first base on a pick-off move.
No serious injuries were reported in the brawl.
