White Sox introduce Cuban prospect Luis Robert

White Sox prospect Luis Robert stands next to GM Rick Hahn at Guaranteed Rate Field.

White Sox first baseman Jose Abreu, left, hugs newly signed Luis Robert.

White Sox first baseman Jose Abreu, left, and Luis Robert at Guaranteed Rate Field.

White Sox chairman Jerry Reinsdorf shakes hands with Luis Robert at Guaranteed Rate Field.

White Sox GM Rick Hahn with Luis Robert during a press conference at Guaranteed Rate Field.

White Sox Luis Robert during a press conference at Guaranteed Rate Field.

White Sox Luis Robert hold up his jersey during a press conference at Guaranteed Rate Field.

White Sox prospect Luis Robert wears a team jersey while standing next to GM Rick Hahn.

Luis Robert throws out the ceremonial first pitch before the game between the White Sox and the Detroit Tigers at Guaranteed Rate Field.

White Sox GM Rick Hahn with prospect Luis Robert during his signing at a press conference at Guaranteed Rate Field.