Serena Williams defeated Maria Sharapova, 6-1, 6-1, in the first round of the U.S. Open on Monday at USTA Billie Jean King National Tennis Center in Queens.

Credit: Kathleen Malone-Van Dyke

Serena Williams reacts during her match against Maria Sharapova during the first round of the U.S. Open at the USTA Billie Jean King National Tennis Center on Monday.

Credit: Kathleen Malone-Van Dyke

Serena Williams waves to fans after defeating Maria Sharapova during the first round of the US Open tennis tournament at the USTA Billie Jean King National Tennis Center on Monday, Aug. 26, 2019.

Credit: Kathleen Malone-Van Dyke

Serena Williams looks to her family and coaches box after defeating Maria Sharapova during the first round of the US Open tennis tournament at the USTA Billie Jean King National Tennis Center on Monday, Aug. 26, 2019.

Credit: Kathleen Malone-Van Dyke

Serena Williams looks for a serve from MariaSharapova during the first round of the US Open tennis tournament at the USTA Billie Jean King National Tennis Center on Monday, Aug. 26, 2019.

Credit: Kathleen Malone-Van Dyke

Serena Williams returns to MariaSharapova during the first round of the US Open tennis tournament at the USTA Billie Jean King National Tennis Center on Monday, Aug. 26, 2019.

Credit: Kathleen Malone-Van Dyke

Serena Williams returns to MariaSharapova during the first round of the US Open tennis tournament at the USTA Billie Jean King National Tennis Center on Monday, Aug. 26, 2019.

Credit: Kathleen Malone-Van Dyke

Serena Williams returns to MariaSharapova during the first round of the US Open tennis tournament at the USTA Billie Jean King National Tennis Center on Monday, Aug. 26, 2019.

Credit: AP/Charles Krupa

Serena Williams returns to Maria Sharapova during the first round of the U.S. Open on Monday.

Credit: AP/Charles Krupa

Maria Sharapova returns to Serena Williams during the first round of the U.S. Open on Monday.

Credit: Getty Images/Matthew Stockman

Maria Sharapova reacts during her women's singles first-round match against Serena Williams during Day 1 of the 2019 U.S. Open at the USTA Billie Jean King National Tennis Center on Monday.

Credit: Getty Images/Matthew Stockman

Serena Williams reacts during her women's singles first-round match against Maria Sharapova during Day 1 of the 2019 U.S. Open at the USTA Billie Jean King National Tennis Center on Monday.

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