Arizona Diamondbacks right-hander Zac Gallen has been getting away with hard contact all season. He might not be able to on Saturday afternoon.

The Diamondbacks head south to Mexico City this weekend for a two-game series against the San Diego Padres. But alongside the excitement of an international showcase comes a unique, challenging condition: the severe elevation of Mexico City.

And that elevation could spell danger for Gallen against a hot-hitting Padres club.

Diamondbacks' Zac Gallen may run into trouble in Mexico City Series

Apr 1, 2026; Phoenix, Arizona, USA; Arizona Diamondbacks pitcher Zac Gallen in the second inning against the Detroit Tigers at Chase Field. Mandatory Credit: Mark J. Rebilas-Imagn Images | Mark J. Rebilas-Imagn Images

Mexico City sits at an elevation of over 7,300 feet.…