By Maria Yagoda
Updated August 10, 2016 12:05 PM
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Credit: Source Instagram

On Tuesday night, Michael Phelps nabbed the gold medal in the 200-meter butterfly … and then took home another gold – his 21st – when Team U.S.A. took first place in the 4×200-meter men’s relay.

In addition to the whole country cheering them on, Phelps and his teammates had some pretty high-profile fans, including the U.S. men’s basketball team, many of whom were in the stands.

Kevin Durant, for one, offered enthusiastic congratulations.

And reminded us that basketball players are really, really big.

Phelps thanked Kyle Lowry, Draymond Green, DeAndre Jordan, Demarcus Cousins and Durant for coming by to support the swimmers.

Another important cheerleader for Phelps? His infant son Boomer, who has already stolen everyone’s heart.

“There was so much emotion and so much build-up for that race over the past four years,” he told NBC after his victory. “I don’t want to say revenge, but that’s kind of what it was. I wanted that race back.” (Phelps had lost the 200-meter butterfly by 5/100ths of a second in the 2012 Olympics in London.)

Tuesday was all-around a great night for the American swimmers, as 19-year-old Katie Ledecky also won gold in the women’s 200-meter freestyle.