Randy Arozarena has been detained in Mexico's Yucatan state for a situation involving allegations of domestic violence.
The Tampa Bay Rays outfielder has been detained "for problems relating to his ex-partner."
Arozarena has not been formally charged yet. Mexican law allows a two-day period for prosecutors to decide whether to bring charges. Normally suspects are held in jail pending that decision.
He hit .377 with 10 homers and 14 RBIs in 20 postseason games for Tampa Bay. He was named MVP of the AL Championship Series.