The 2018 United States Open started with a cool new building, stayed up late, melted into a puddle of sweat, and then ended with a shower of boos that echoed into the next day.

It was exhilarating and exhausting. Mostly, it was weird.

Here are some of the highlights and oddities:

Friday, Aug. 24

The Lucky Loser

6:30 p.m.

Peter Polansky, who lost in the final round of qualifying, makes the main draw as a lucky loser for the fourth consecutive major — an unusual Grand Slam of sorts.

Saturday, Aug. 25

Serena’s Fashion Statement

10:30 a.m.

At her pretournament news conference, Serena Williams plays down the growing uproar over comments made by French Tennis Federation president, Bernard Giudicelli, who said the catsuit-style outfit she had worn at the French Open this year would not be allowed again. Williams said she wouldn’t have worn the catsuit again anyhow: “When it comes to fashion, you don’t want to be a repeat offender.”