Serena Williams of the USA shakes hands with Maria Sharapova of Russia after their first round match on day one of the 2019 U.S. Open tennis tournament at USTA Billie Jean King National Tennis Center, Flushing, NY, USA, Aug 26, 2019. Serena Williams trounced old foe Maria Sharapova 6-1 6-1 in their blockbuster first round clash at the U.S. Open on Monday to get her quest for a record-tying 24th Grand Slam title off to a flying start. Robert Deutsch-USA TODAY Sports

Serena Williams of the USA hits to Maria Sharapova of Russia in the first round on day one of the 2019 U.S. Open tennis tournament at USTA Billie Jean King National Tennis Center, Flushing, NY, USA, Aug 26, 2019. Serena Williams trounced old foe Maria Sharapova 6-1 6-1 in their blockbuster first round clash at the U.S. Open on Monday to get her quest for a record-tying 24th Grand Slam title off to a flying start. Robert Deutsch-USA TODAY Sports

Serena Williams of the USA hits to Maria Sharapova of Russia in the first round on day one of the 2019 U.S. Open tennis tournament at USTA Billie Jean King National Tennis Center, Flushing, NY, USA, Aug 26, 2019. Serena Williams trounced old foe Maria Sharapova 6-1 6-1 in their blockbuster first round clash at the U.S. Open on Monday to get her quest for a record-tying 24th Grand Slam title off to a flying start. Robert Deutsch-USA TODAY Sports

Maria Sharapova of Russia hits to Serena Williams of the USA in the first round on day one of the 2019 U.S. Open tennis tournament at USTA Billie Jean King National Tennis Center, Flushing, NY, USA, Aug 26, 2019. Serena Williams trounced old foe Maria Sharapova 6-1 6-1 in their blockbuster first round clash at the U.S. Open on Monday to get her quest for a record-tying 24th Grand Slam title off to a flying start. Robert Deutsch-USA TODAY Sports

Serena Williams of the United States returns a shot against Maria Sharapova of Russia in a first round match on day one of the 2019 U.S. Open tennis tournament at USTA Billie Jean King National Tennis Center, Flushing, NY, USA, Aug 26, 2019. Serena Williams trounced old foe Maria Sharapova 6-1 6-1 in their blockbuster first round clash at the U.S. Open on Monday to get her quest for a record-tying 24th Grand Slam title off to a flying start. Jerry Lai-USA TODAY Sports

Serena Williams of the United States (left) and Maria Sharapova of Russia meet at the net after a first round match on day one of the 2019 U.S. Open tennis tournament at USTA Billie Jean King National Tennis Center, Flushing, NY, USA, Aug 26, 2019. Serena Williams trounced old foe Maria Sharapova 6-1 6-1 in their blockbuster first round clash at the U.S. Open on Monday to get her quest for a record-tying 24th Grand Slam title off to a flying start. Jerry Lai-USA TODAY Sports