Line-drive doubles, double plays, double steals – the game of baseball is full of doubles, and the Tulua twins, Siale and Sione of the class of 2028, aimed to leave their own “double” mark on the sport with their debut on the Breakthrough Series team at the recently concluded 2025 Arizona Jr. Fall Classic.

The identical twins from Union City, Calif., represented the future of the MLB Develops program and the growing potential of the Major League youth development pipeline that has already produced Major League stars like Reds pitcher Hunter Greene, A’s outfielder Lawrence Butler and Rays outfielder Chandler Simpson.

“We saw Sione and Siale back in February at the ID Tour in Sunnyvale, California, and were really just locked in on their physical presence,” said Kindu Jones, manager of

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