Just like that, it’s over.

Novak Djokovic’s run in the Rio de Janeiro Olympic Games ended in the blink of an eye, as the world No. 1 lost in the singles and doubles competitions in consecutive days. On Sunday, the world No. 1 was stunned by Juan Martin del Potro, 7-6 (4), 7-6 (2), in the first round. Then on Monday, Djokovic and teammate Nenad Zimonjic fell to Brazilians Marcelo Melo and Bruno Soares, 6-4, 6-4.

After that defeat, the 12-time Grand Slam champion announced that he will not play mixed doubles for Serbia in Rio.

Djokovic will reportedly skip next week’s Western & Southern Open in Cincinnati, the only Masters 1000 tournament that he hasn’t won. The next event he’ll play will be the U.S. Open, the fourth and final major of the year. He’s won the title in Flushing Meadows twice.

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There has been speculation that the 29-year-old is nursing an injury, though it’s unclear what’s ailing him.

Djokovic has looked uncharacteristically beatable this summer. After winning the French Open in early June—his fourth straight major title—he shockingly crashed out in the third round of Wimbledon before coming up short at the Games. In between his disappointing showings in London and Brazil, he did win his 30th career Masters title in Toronto.

Follow Brad on Twitter @brad_kallet.