Chicago White Sox prospect Luis Robert launched a grand slam on Wednesday afternoon, but the story behind the prodigious blast may be even cooler.

Fellow prospect Eloy Jimenez, who is currently dealing with tendinitis in his left knee, says he was sitting in the team’s dugout during their game against the Cincinnati Reds when Robert made a bold prediction about his late game at-bat.

“He said in the dugout, ‘I’m the only guy who doesn’t have a hit today. I’m going to do something,’” Jimenez recalled to the Chicago Sun-Times. “And he did it.”

What Robert did was launch a grand slam onto the left field berm, giving the White Sox a 14-12 lead over the Reds. The Sox ended up winning the game thanks to the blast, Robert’s first of the spring.

As for Jimenez, he’s looking to make an impact on the field this weekend, as he’s trying to get into the team’s lineup against the Chicago Cubs on Saturday afternoon. The Cubs traded Jimenez to the White Sox in the Jose Quintana swap last summer, so Jimenez is looking to get his first crack against his former team.