Lucas Giolito will enter the second half of the MLB season as a single man ... TMZ Sports has learned the White Sox star's wife just filed for divorce.
Ariana Dubelko filed the docs in a Los Angeles court on Monday afternoon. She cited "irreconcilable differences" as the reason for the split.
In her filing, Dubelko also asked for spousal support from the 28-year-old pitcher, who's making $10.4 million with Chicago this season.
Despite Dubelko filing, a rep for Giolito told us the split was "a mutually agreed upon and amicable decision made by both parties.