What Serena Williams and Madison Keys will be wearing at the US Open

Courtesy of Nike

The pleats in Serena's skirt were designed to allow for range of movement.

Serena Williams' right shoulder may still be in question, but we do have the final verdict on her winning look for the 2016 US Open.

The 34-year-old living legend will be decked out in Nike gear -- a sponsor she's had since 2013. Joining her will be fellow American Madison Keys, 21, who signed with the athletic brand in 2014.

Courtesy of Nike

Keys faces off with Alison Riske on Monday night in her opening-round match.

According to Nike officials, "Each piece is designed with the goal of supporting temperature regulation to help athletes prepare for the heat and humidity of NYC in August."

Courtesy of Nike

When the evening chill hits Arthur Ashe Stadium, Nike has Serena covered.

The top-ranked Williams is in hot pursuit of her 23rd major title, which would break the Open era record she currently shares with Steffi Graf.

Ericka N. Goodman-Hughey is a senior editor at espnW. Follow her on Twitter @ericka_editor

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