Simone Biles on Sunday became the most decorated gymnast in world championship history, winning gold medals in the balance beam and the floor exercise to increase her career medal total in the championships to 25.

The record medal count — two more than the previous high, held for more than two decades by Vitaly Scherbo of Belarus — strengthened the case of those who already consider Biles, at 22, to be the greatest gymnast of all time.

“I can’t be more thrilled with the performance that I put out at this world championships,” Biles said. But she seemed surprisingly nonchalant about breaking a career record that had stood for two decades. “I’m not a number person.”