U.S. athletes Simone Biles, Michael Phelps, and Katie Ledecky star in Rio Olympics tonight

Fans of gymnast Simone Biles and swimmers Michael Phelps and Katie Ledecky will want to tune into the Rio Olympic Games on Tuesday night. Biles and the U.S. women's gymnastics team will vie for the gold they're expected to win in the women's team all-around final. China and Russia are also contenders.

In the pool, Ledecky will compete in the 200-meter freestyle final, just two days after she shattered her record in the 400-meter freestyle to win her first gold. If Ledecky lands a win tonight, she'll be one medal away from being the first female swimmer since 1968 to win gold in the 200-, 400-, and 800-meter freestyle all within one Olympic Games.

And, in what The New York Times described as "one of the most anticipated showdowns of the Rio Games," Phelps will race the 200-meter butterfly against South Africa's Chad Le Clos, who he lost to in 2012.

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As of Tuesday afternoon, the U.S. and China were tied with five gold medals each, though the U.S. was ahead overall with seven silver medals and eight bronze to China's three silver and five bronze.