Ronald Acuña Jr. is the first player in MLB history to record 40 home runs and 70 stolen bases in a single season. The Atlanta Braves outfielder achieved this historic milestone on September 30, 2023, against the Miami Marlins. Acuña Jr. also became the first player ever to join the 40-70 club, surpassing the likes of legends like Jose Canseco and Barry Bonds, who came close but never reached both marks in the same season. This incredible feat cements Acuña Jr.'s place among the game's all-time greats and adds another chapter to his already legendary career.