Dallas Mavericks star Dirk Nowitzki is doing his part for Hurricane Harvey relief by donating proceeds from his upcoming charity tennis event. And now, Mavs owner Mark Cuban is set to do his share by matching all the proceeds from that event up to $2 million, Nowitzki announced on his Twitter feed.

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Nowitzki, who was an avid tennis player in his youth, will hold his tennis event on September 16 at the SMU Tennis Center. Professional tennis players Andy Roddick and Tommy Haas, actor Owen Wilson, and Mavs guard J.J. Barea, are among the celebrities set to take part.

Mark Cuban joins outgoing Rockets owner Leslie Alexander among NBA owners who have donated to the Hurricane Harvey relief cause. Alexander initially pledged $4 million for hurricane relief, but soon upped it to $10 million.

While the Rockets are a fierce state rival of the Mavericks, it’s always refreshing to see the likes of Cuban and Nowitzki setting those sports rivalries aside and contributing in their own way toward helping the city of Houston rise up from the devastation of Hurricane Harvey.