Kerri Walsh Jennings

One of the most dominant runs in sports has come to an end. Kerri Walsh Jennings is now 26-1 in Olympic beach volleyball after suffering her first loss in four Olympics Tuesday night in the Rio semifinals.

After playing on the U.S. Women's Indoor Volleyball Team in the 2000 Olympics, Walsh Jennings moved to beach volleyball. Teaming with Misty May-Treanor, she won her first World Championships in 2003 in Rio de Janeiro. From 2003-2012, Walsh Jennings and May-Treanor won three Olympic gold medals, three World Championships gold medals and one World Championships silver medal. Entering her fourth Olympics on the beach in 2016, Walsh Jennings had never lost a match. She lost one Olympic set, coming in 2012.

May-Treanor retired after the 2012 Olympics, where the duo won gold with Walsh Jennings five weeks pregnant. Since 2013, Walsh Jennings has partnered with April Ross, a silver medalist in London. The duo won all four of their 2016 AVP Tour Olympic tune-ups. Through the quarterfinals, Walsh Jennings and Ross were 5-0, losing just one set along the way.

Related: Kerri Walsh Jennings' Rio Journey Includes Whole Family

Brazilian pairing Ágatha and Bárbara, the No. 2 seed, came into the match 4-1, but proved less vulnerable than the Americans. Feeding off a hometown crowd shaking the sand at Copacabana Stadium for the midnight local time start, Ágatha and Bárbara claimed a tight first set and kept at least a two-point lead most of the second set. With a score of 22-20, 21-18, Brazil punched its ticket to the final and delivered Kerri Walsh Jennings her first-ever Olympic loss.

"They outplayed us pretty much in every way," Walsh Jennings said after the match. "Not out-hustled us, not out-hearted us, not out-team work us. Just outplayed us."

Ágatha and Bárbara get Germans Laura Ludwig and Kira Walkenhorst in the gold medal match Wednesday. Walsh Jennings and Ross will play for bronze Wednesday against Brazilians Larissa and Talita, the No. 1 seed. Larissa won a bronze medal in London.

Related: Loves Notorious B.I.G. And One Direction: Get To Know Olympian April Ross

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-- Watch 15-Year-Old Michael Phelps Predict He'll Win Gold Medals

Follow Jeffrey Eisenband on Twitter @JeffEisenband.