Rio Olympics 2016: Michael Phelps wins 19th gold medal, check out his impressive tally

Michael Phelps has to clear out more space in his medal case.

Time to make room for gold number 19.

With yet another dazzling performance, the most decorated athlete in Olympic history added to his staggering haul on Sunday night in the 4x100-meter freestyle relay, giving the United States a lead it never relinquished.

“When I was on the block, I honestly thought my heart was going to explode out of my chest,” Phelps said. “I was so hyped tonight and so excited.”

“Coming off the wall I thought my kickout was great,” Phelps said. “I just wanted to hammer it, hit the touch and give them a bigger lead.”

That he did.

Ryan Held kept the Americans in front before giving way to Nathan Adrian, the nation’s best sprinter.

At that point, it wasn’t really in doubt.

But Phelps wasn’t taking any chances, pounding the starting block and shouting toward Adrian as the anchor made the turn for home.

When Adrian touched the wall first in 3 minutes, 9.92 seconds, Phelps thrust his right arm in the air and looked toward his infant son Boomer, nuzzling in the arms of his mother Nicole Johnson, the roaring crowd blocked out by noise-canceling headphones.

Little Boomer won’t remember what his daddy did this night.

But that gold medal will never let him forget.

Phelps, the most decorated Olympian of all time, now has 19 golds, two silvers and two bronzes.

Check out his impressive Olympics medal tally

GOLD: 19; SILVER 2; BRONZE: 2

2004 (Athens) 400 Individual Medley (Gold-WR)

100 Butterfly (Gold-OR)

200 Butterfly (Gold-OR)

200 Individual Medley (Gold-OR)

4X100 Medley Relay (Gold)

4X200 Freestyle Relay (Gold)

200 Freestyle (Bronze)

4X100 Freestyle Relay (Bronze)

2008 (Beijing) 200 Freestyle (Gold-WR)

4X100 Freestyle Relay (Gold-WR)

4X200 Freestyle Relay (Gold-WR)

200 Butterfly (Gold-WR)

200 Individual Medley (Gold-WR)

400 Individual Medley (Gold-WR)

4X100 Medley Relay (Gold-WR)

100 Butterfly (Gold-OR)

2012 (London) 100 Butterfly (Gold)

200 Individual Medley (Gold)

4X100 Medley Relay (Gold)

4X200 Freestyle Relay (Gold)

4X100 Freestyle Relay (Silver)

200 Butterfly (Silver)

2016 (Rio De Janeiro) 4X100 Freestyle Relay (Gold)

With inputs from agencies