Katie Ledecky is an overwhelming favorite to claim her first gold of these Games with one of her best events in the pool highlighting Wednesday’s action at the 2024 Paris Olympics.

Here is a guide of what to look out for:

Ledecky looking to defend gold in the 1,500 freestyle

When the women’s 1,500-meter freestyle made its debut on the Olympic program in Tokyo three years ago, Ledecky won by more than a four-second margin.

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Here’s what to know about Seine River water quality during the Paris Olympics

This time it could be an even bigger margin.

Ledecky won her heat Tuesday by more than a half-lap ahead of Simona Quadarella of Italy.

The 1,500 final is scheduled for 9:13 p.m. CEST (3:13 p.m. EDT).

Ledecky’s only medal so far in Paris was a bronze in the 400 free.

The other swimming finals on Wednesday will be held between 8:30 p.m. CEST (2:30 p.m. EDT) and about 10:45 p.m. CEST (4:45 p.m. EDT). They include the women’s 100 free, the men’s 200 butterfly, the men’s 200 breaststroke and the men’s 100 free.

Triathlon questions

The men’s triathlon scheduled for Tuesday was postponed because of concerns about the water quality in the Seine River. It was rescheduled for Wednesday, when the women’s competition is also slated to be held.

But both will happen only if water tests show acceptable levels of E. coli and other bacteria. Friday is also planned as a backup date.

However, storms or rain are forecast Tuesday night through Thursday, which could complicate rescheduling because rain generally causes bacteria levels in the Seine to rise.

A man wipes his face as he walks past reproductions of artworks decorating the banks of the River Seine at the 2024 Summer Olympics, Tuesday, July 30, 2024, in Paris, France. The men’s Olympic triathlon has been postponed over concerns about water quality in Paris’ Seine River, where the swimming portion of the race was supposed to take place. (AP Photo/Vadim Ghirda)

If Wednesday’s races do go ahead, the women will start at 8 a.m. CEST (2 a.m. EDT) and the men will start at 10:45 a.m. CEST (4:45 a.m. EDT).

Djokovic and Alcaraz back on the red clay

Still chasing the only big title he lacks after getting past longtime rival Rafael Nadal, Novak Djokovic faces Dominik Koepfer of Germany in the third round at Roland Garros.

Serbia’s Novak Djokovic gestures as he leaves the court after defeating Spain’s Rafael Nadal in their men’s singles second round match at the Roland Garros stadium at the 2024 Summer Olympics, Monday, July 29, 2024, in Paris, France. Novak Djokovic dominated rival Rafael Nadal to win 6-1, 6-4 at the Paris Olympics in the second round. (AP Photo/Andy Wong)

Carlos Alcaraz, who won the French Open at the same venue last month, plays Roman Safiullin of Russia.

Carlos Alcaraz of Spain celebrates after defeating Tallon Griekspoor of the Netherlands in their men’s singles second round match, at the 2024 Summer Olympics, Monday, July 29, 2024, at the Roland Garros stadium in Paris, France. (AP Photo/Andy Wong)

Gymnastics

The men’s all-around final in gymnastics is scheduled for 5:30 p.m. CEST (11:30 EDT).