Defending Olympic champion Nathan Adrian barely advanced in the preliminaries of the 100-meter freestyle at the Rio Olympics.

He wasn’t taking any chances in the semifinals Tuesday night.

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Competing in lane eight, Adrian posted the fastest time out of 16 swimmers, sending him to Wednesday’s final with a much more customary position in the center of the pool.

The biggest cheers at the Olympic Aquatic Center were for Brazil’s Marcelo Chierighini, who advanced to the final with the eighth-best time.